biology ia research questions examples

IB Biology IA: 60 Examples and Guidance

Charles Whitehouse

The International Baccalaureate (IB) program offers a variety of assessments for students, including Internal Assessments (IAs), which are pieces of coursework marked by students’ teachers. The Biology IA is an assessment designed to test students' understanding of the material they have learned in their biology course and their ability to conduct independent research.

What is the IA?

The IA consists of a laboratory report that students must complete during their IB biology course. For assessments before May 2025, the report should be 6 to 12 pages in length and should include a research question, a methodology section, data analysis, and a conclusion. From May 2025 , the report should be a maximum of 3,000 words.

What should the IA contain?

The research question for the internal assessment should be a testable question that is related to the biology curriculum. It's essential that the question is relevant to the biology curriculum, specific and clearly defined. The methodology section should explain how the research was conducted, including the materials and methods used. The methodology should be detailed and well-explained, and should include information on the materials and methods used, as well as any ethical considerations.

Data analysis is an important aspect of the IA. Students should present their data in a clear and organized manner, and should use appropriate statistical analysis to interpret their results. They should also make sure to include a discussion of the limitations of their study and the implications of their findings.

The conclusion should summarise the main findings of the study and should relate the results back to the research question. It should also include recommendations for further research.

In addition to the laboratory report, students must also complete a reflective statement. Online tutors recommend that this statement should be around 500 words long, and should reflect on the student’s learning during the internal assessment process. The reflective statement should include a description of the student’s personal learning process, including successes and challenges, as well as an evaluation of their performance on the internal assessment and the skills they have gained through the process.

Have a look at our comprehensive set resources for IB Biology developed by expert IB teachers and examiners!

- IB Biology 2024 Study Notes

- IB Biology 2025 Study Notes

- IB Biology 2024 Questions

- IB Biology 2025 Questions

What are some example research questions?

Here are examples with details of potential research questions, written by expert IB Biology tutors and teachers, that could inspire your Biology IA:

1 - Investigating the effect of different types of sugars on the rate of fermentation by yeast. To investigate the effect of different concentrations of a specific herbicide on the growth rate of a particular plant species, one could set up an experiment in which the plants are grown in soil with varying concentrations of the herbicide. An appropriate range of concentrations and a suitable plant species would need to be chosen, along with control variables such as light, temperature, and watering. The growth rate of the plants could be measured by tracking their height or mass over a set period of time. Comparing the growth rates of the different groups would determine the impact of the herbicide on the plant's growth.

2 - How does the pH of a solution affect the activity of an enzyme? To investigate the effect of pH on enzyme activity, one could set up an experiment in which the enzyme is exposed to solutions with varying pH levels. The enzyme's activity could be measured by monitoring the rate of a specific reaction catalyzed by the enzyme. Control variables such as temperature, substrate concentration, and enzyme concentration would need to be kept constant. By comparing the activity of the enzyme at different pH levels, the optimal pH range for the enzyme could be determined.

3 - Can the concentration of vitamin C in different types of fruit juice be determined using titration?

To determine the concentration of vitamin C in different types of fruit juice using titration, a standardized solution of a known concentration of potassium permanganate would be prepared. A sample of the fruit juice would be titrated with the potassium permanganate solution until the endpoint is reached, indicating that all the vitamin C has reacted with the potassium permanganate. The concentration of vitamin C in the fruit juice can then be calculated based on the volume and concentration of the potassium permanganate solution used in the titration. This process would need to be repeated for each type of fruit juice being tested.

4 - Investigating the effect of light intensity on the rate of photosynthesis in aquatic plants.

Set up an experiment in which aquatic plants are placed in containers with varying levels of light intensity. The light intensity could be controlled by adjusting the distance between the light source and the plants. The rate of photosynthesis could be measured by tracking the amount of oxygen produced by the plants over a set period of time. Comparing the rates of photosynthesis of the different groups would determine the impact of light intensity on the plant's photosynthetic activity. Control variables such as temperature, water quality, and plant species would need to be kept constant.

5 - How does the concentration of carbon dioxide affect the rate of photosynthesis in terrestrial plants?

Conduct an experiment in which plants are grown under different concentrations of carbon dioxide. The plants would need to be grown in a controlled environment with consistent light, temperature, and watering. The rate of photosynthesis could be measured by monitoring the oxygen production of the plants using a dissolved oxygen probe. The results could then be analyzed to determine how the concentration of carbon dioxide affects the rate of photosynthesis in terrestrial plants.

6 - Can the presence of glucose in urine be determined using Benedict's test?

Collect a urine sample from the individual being tested. Add Benedict's reagent to the sample and heat it in a water bath. If glucose is present in the urine, it will react with the Benedict's reagent and cause a color change. The intensity of the color change can be compared to a color chart to determine the concentration of glucose in the urine. This process would need to be repeated for each urine sample being tested.

7 - Investigating the effect of temperature on the respiration rate of germinating seeds.

Set up an experiment in which germinating seeds are exposed to different temperatures. The respiration rate of the seeds could be measured by monitoring the amount of oxygen consumed or carbon dioxide produced over a set period of time. The experiment would need to control for other variables such as the type of seed, the amount of water and nutrients provided, and the length of time the seeds have been germinating. Comparing the respiration rates of the different groups would determine the effect of temperature on the seeds' respiration rate.

8 - How does the concentration of salt in a solution affect the growth of bacteria?

Prepare a series of solutions with varying concentrations of salt, and inoculate each with a known amount of bacteria. The solutions would need to be incubated at a constant temperature for a set period of time, and the growth of the bacteria could be measured by counting the number of colonies or by using a spectrophotometer to measure the optical density of the solution. Comparing the growth rates of the bacteria in the different salt concentrations would determine the effect of salt on bacterial growth. Control variables such as pH, temperature, and nutrient availability would need to be kept constant.

9 - Can the concentration of nitrogen compounds in soil be determined using colorimetry?

Collect soil samples from different locations and extract the nitrogen compounds using a suitable method such as Kjeldahl digestion. The extracted compounds can then be analyzed using colorimetry, which involves adding a reagent that reacts with the nitrogen compounds and produces a color. The intensity of the color can be measured using a spectrophotometer, and the concentration of nitrogen compounds in the soil can be calculated based on the absorbance of the color. This process would need to be repeated for each soil sample being tested.

10 - Investigating the effect of different types of plant hormones on the growth of seedlings.

Set up an experiment in which seedlings are grown in different concentrations of plant hormones, with control variables such as light, temperature, and watering. The growth rate of the seedlings could be measured by tracking their height or mass over a set period of time. Comparing the growth rates of the different groups would determine the impact of the plant hormones on the seedlings' growth. The experiment could also include observations of other plant characteristics such as leaf size and color, root development, and overall health.

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11 - How does the concentration of salt in water affect the hatching rate of brine shrimp?

Set up multiple containers with different concentrations of salt water and add brine shrimp eggs to each container. The containers should be kept at a consistent temperature and light level. After a set period of time, count the number of hatched brine shrimp in each container and calculate the hatching rate. Comparing the hatching rates of the different containers would determine the effect of salt concentration on the hatching rate of brine shrimp.

12 - Can the rate of mitosis be determined using microscopy techniques?

Collect a sample of cells undergoing mitosis and prepare them for microscopy. Using a microscope, observe the cells and record the time it takes for each cell to complete each stage of mitosis. The rate of mitosis can then be calculated by dividing the time taken for each stage by the total time taken for the entire process. This process would need to be repeated for multiple cells to ensure accuracy and reliability of the results.

13 - Investigating the effect of different types of antibiotics on the growth of bacteria.

Culture bacteria in petri dishes with different concentrations of antibiotics. The growth of the bacteria can be observed and measured over a set period of time. The concentration of antibiotic that inhibits the growth of the bacteria can be determined, and the effectiveness of different types of antibiotics can be compared. Control variables such as temperature, humidity, and nutrient availability would need to be kept constant to ensure accurate results.

14 - How does the concentration of oxygen affect the respiration rate of crickets?

Set up a series of chambers with different concentrations of oxygen, ranging from low to high. Place crickets in each chamber and monitor their respiration rate by measuring the amount of oxygen consumed and carbon dioxide produced over a set period of time. The results can be analyzed to determine the effect of oxygen concentration on the respiration rate of crickets. Control variables such as temperature and humidity would need to be kept constant throughout the experiment.

15 - Can the concentration of glucose in blood be determined using glucose oxidase and spectrophotometry?

A sample of blood would be mixed with glucose oxidase, which converts glucose to hydrogen peroxide. The amount of hydrogen peroxide produced is proportional to the amount of glucose in the sample. A spectrophotometer would then be used to measure the absorbance of the sample at a specific wavelength, which is also proportional to the amount of hydrogen peroxide present. The concentration of glucose in the blood sample can then be calculated based on the absorbance reading and a standard curve generated using known concentrations of glucose. This process would need to be repeated for each blood sample being tested.

16 - Investigating the effect of different types of pesticides on the growth of bean plants.

Set up an experiment in which bean plants are grown in soil treated with varying concentrations of different pesticides. An appropriate range of concentrations and a suitable plant species would need to be chosen, along with control variables such as light, temperature, and watering. The growth rate of the plants could be measured by tracking their height or mass over a set period of time. Comparing the growth rates of the different groups would determine the impact of the pesticides on the plant's growth. Additionally, the health of the plants could be assessed by examining their leaves for signs of damage or discoloration.

17 - How does the concentration of light affect the growth of algae?

Set up multiple containers with different concentrations of light, ranging from low to high. In each container, add a sample of algae and monitor their growth over a set period of time. The growth rate of the algae can be measured by tracking their biomass or chlorophyll content. Comparing the growth rates of the different groups would determine the impact of light concentration on the growth of algae. Control variables such as temperature, nutrient availability, and water quality would need to be maintained to ensure accurate results.

18 - Can the presence of starch in leaves be determined using iodine solution?

Obtain a sample of the leaf and grind it into a fine powder. Add a few drops of iodine solution to the powder and observe the color change. If the solution turns blue-black, it indicates the presence of starch in the leaf. This process would need to be repeated for multiple leaves from different plants to ensure accuracy and reliability of the results. Control variables such as the age of the leaf and the time of day the sample is taken should also be considered.

19 - Investigating the effect of different types of plant nutrients on the growth of tomatoes.

Set up an experiment in which tomato plants are grown in soil with varying concentrations of different plant nutrients, such as nitrogen, phosphorus, and potassium. Control variables such as light, temperature, and watering would need to be maintained. The growth rate of the plants could be measured by tracking their height or mass over a set period of time. Comparing the growth rates of the different groups would determine the impact of the plant nutrients on the plant's growth. Additionally, the nutrient content of the tomato plants could be analyzed to determine if there is a correlation between the nutrient concentration in the soil and the nutrient content in the plant.

20 - How does the concentration of carbon dioxide affect the growth of marine plants?

Conduct an experiment in which marine plants are grown in water with varying concentrations of carbon dioxide. The carbon dioxide concentration could be controlled by bubbling different amounts of carbon dioxide gas into the water. The growth rate of the plants could be measured by tracking their height, mass, or chlorophyll content over a set period of time. Comparing the growth rates of the different groups would determine the impact of carbon dioxide concentration on the plant's growth. Other variables such as light, temperature, and nutrient availability would need to be controlled to ensure that any differences in growth rate are due to the carbon dioxide concentration.

21 - Can the concentration of protein in an egg be determined using the Biuret method?

To determine the concentration of protein in an egg using the Biuret method, the egg would need to be homogenized and the protein extracted. A Biuret reagent would then be added to the protein extract, which would cause a color change if protein is present. The intensity of the color change would be proportional to the concentration of protein in the egg. A standard curve could be created using known concentrations of protein to determine the concentration of protein in the egg sample. This process would need to be repeated for each egg being tested.

22 - Investigating the effect of different types of plant hormones on the root growth of seedlings.

Set up an experiment in which seedlings are grown in soil with different concentrations of plant hormones. An appropriate range of concentrations and a suitable plant species would need to be chosen, along with control variables such as light, temperature, and watering. The root growth of the seedlings could be measured by tracking their length or mass over a set period of time. Comparing the root growth of the different groups would determine the impact of the plant hormones on the seedling's root growth.

23 - How does the concentration of oxygen affect the respiration rate of goldfish?

Set up multiple tanks with goldfish and varying levels of oxygen concentration. The respiration rate of the goldfish can be measured by tracking their oxygen consumption or carbon dioxide production. The experiment would need to be conducted over a set period of time with control variables such as temperature and feeding schedules. Comparing the respiration rates of the different groups would determine the effect of oxygen concentration on the goldfish's respiration rate.

24 - Can the concentration of a specific hormone in blood be determined using ELISA?

ELISA (enzyme-linked immunosorbent assay) involves coating a microplate with a specific antibody that binds to the hormone of interest. The sample of blood is then added to the plate, and any hormone present in the sample will bind to the antibody. A secondary antibody that is linked to an enzyme is then added, which will bind to the hormone-antibody complex. The enzyme will then catalyze a reaction that produces a detectable signal, such as a color change. The intensity of the signal is proportional to the amount of hormone present in the sample, allowing for the concentration of the hormone to be determined. A standard curve can be created using known concentrations of the hormone to accurately quantify the concentration in the sample.

25 - Investigating the effect of different types of pollutants on the growth of watercress.

Set up an experiment in which watercress plants are grown in water contaminated with different types and concentrations of pollutants. The growth rate of the plants could be measured by tracking their height or mass over a set period of time. Comparing the growth rates of the different groups would determine the impact of the pollutants on the plant's growth. Control variables such as light, temperature, and watering would need to be kept constant to ensure accurate results. The types and concentrations of pollutants used in the experiment would need to be carefully chosen based on their potential impact on watercress growth and their relevance to real-world pollution scenarios.

26 - How does the concentration of light affect the rate of respiration in germinating seeds?

Set up a series of experiments in which germinating seeds are exposed to different intensities of light. The rate of respiration could be measured by tracking the amount of oxygen consumed or carbon dioxide produced by the seeds over a set period of time. The experiment would need to control for other variables such as temperature and humidity. Comparing the rates of respiration for the different light intensities would determine the impact of light concentration on the rate of respiration in germinating seeds.

27 - Can the concentration of nitrates in water be determined using colorimetry?

Prepare a series of standard solutions of known concentrations of nitrates. A sample of the water would be mixed with a reagent that reacts with nitrates to produce a colored product. The intensity of the color would be measured using a colorimeter, and the concentration of nitrates in the water can be calculated based on the intensity of the color and the concentration of the standard solutions. This process would need to be repeated for each water sample being tested.

28 - Investigating the effect of different types of disinfectants on the growth of bacteria.

Prepare a culture of bacteria and divide it into multiple groups. Each group would be exposed to a different type of disinfectant, while control groups would not be exposed to any disinfectant. The growth rate of the bacteria in each group would be measured over a set period of time, either by counting the number of colonies or by measuring the turbidity of the culture. Comparing the growth rates of the different groups would determine the effectiveness of each disinfectant on inhibiting bacterial growth.

29 - How does the concentration of salt in water affect the growth of duckweed?

Set up multiple containers of water with varying concentrations of salt. Add duckweed to each container and monitor their growth over a set period of time. The growth rate of the duckweed can be measured by tracking their surface area or biomass. Comparing the growth rates of the different groups would determine the impact of salt concentration on the growth of duckweed. Control variables such as light, temperature, and nutrients should be kept constant across all containers.

30 - Can the concentration of ethanol in different types of alcoholic beverages be determined using gas chromatography?

Use gas chromatography to separate the components of the alcoholic beverage sample. The ethanol would be detected and quantified using a detector such as a flame ionization detector. The concentration of ethanol in each sample can then be calculated based on the peak area or height of the ethanol peak in the chromatogram. This process would need to be repeated for each type of alcoholic beverage being tested.

31 - Investigating the effects of different types of exercise on heart rate and blood pressure.

Recruit a group of participants and randomly assign them to different exercise groups (e.g. running, cycling, weightlifting). Measure their heart rate and blood pressure before and after the exercise session. Repeat this process for each exercise group. Analyze the data to determine if there are any significant differences in the effects of the different types of exercise on heart rate and blood pressure. Control variables such as age, gender, and fitness level should be taken into account.

32 - How does the level of noise pollution affect the behavior and communication of animals?

Conduct a field study in which the behavior and communication of animals in areas with varying levels of noise pollution are observed and recorded. Control variables such as time of day, weather conditions, and animal species would need to be taken into account. The observations could include changes in vocalizations, movement patterns, and social interactions. Comparing the behavior and communication of animals in areas with different levels of noise pollution would determine the impact of noise on their behavior. Statistical analysis could be used to establish correlations between noise levels and changes in animal behavior.

33 - Investigating the effects of different types of fertilizers on plant growth and nutrient uptake.

Set up an experiment in which identical plants are grown in soil with different types of fertilizers. The growth rate of the plants could be measured by tracking their height or mass over a set period of time. Nutrient uptake could be measured by analyzing the nutrient content of the plants at the end of the experiment. Comparing the growth rates and nutrient uptake of the different groups would determine the impact of the fertilizers on plant growth and nutrient uptake. Control variables such as light, temperature, and watering would need to be kept constant.

34 - How does exposure to light pollution affect the migration and behavior of nocturnal animals?

Conduct a field study in which nocturnal animals are observed in areas with varying levels of light pollution. The behavior and migration patterns of the animals could be tracked using GPS or radio telemetry. Data on the animals' activity levels, movement patterns, and habitat use could be collected and compared between areas with different levels of light pollution. This would allow for an assessment of the impact of light pollution on nocturnal animals and their ecosystems.

35 - Investigating the effects of different types of water pollution on aquatic ecosystems and organisms.

Set up multiple tanks or containers with different types and levels of water pollution, such as oil spills, chemical runoff, or excess nutrients. Populate each tank with a variety of aquatic organisms, such as fish, algae, and invertebrates. Monitor the health and behavior of the organisms over a set period of time, noting any changes in growth, reproduction, or mortality rates. Comparing the results from each tank would allow for an assessment of the impact of different types of water pollution on aquatic ecosystems and organisms.

36 - How does exposure to electromagnetic radiation affect the growth and development of plants?

Set up an experiment in which plants are exposed to different levels of electromagnetic radiation, such as UV light or radio waves. The plants would need to be grown in a controlled environment with consistent light, temperature, and watering. The growth rate and development of the plants could be measured by tracking their height, leaf size, and overall health over a set period of time. Comparing the growth and development of the plants exposed to different levels of electromagnetic radiation would determine the impact of the radiation on the plants. Control groups of plants not exposed to radiation would also need to be included for comparison.

37 - Investigating the effects of different types of air pollution on respiratory function and lung health.

Recruit a sample of participants who are exposed to different types of air pollution, such as those who live near busy roads or industrial areas. Conduct lung function tests, such as spirometry, on each participant to establish a baseline measurement of their respiratory health. Repeat the tests after a set period of time to determine any changes in lung function. Comparing the results of participants exposed to different types of air pollution would determine the impact of each type on respiratory function and lung health. Other factors, such as age and smoking status, would need to be controlled for in the analysis.

38 - How does the level of acidity affect the growth and survival of aquatic organisms?

Conduct experiments in which aquatic organisms are exposed to different levels of acidity. The organisms could be placed in tanks with varying pH levels, and their survival and growth rates could be monitored over time. Control variables such as temperature, light, and food availability would need to be kept constant. Comparing the survival and growth rates of the different groups would determine the impact of acidity on the organisms. Additionally, other factors such as changes in behavior or reproduction could also be observed and analyzed.

39 - Investigating the effects of different types of food additives on human health and metabolism.

Conduct a literature review to identify the potential health effects of different food additives. Design a study in which participants consume a controlled diet with varying levels of the food additives being tested. Blood and urine samples could be collected at regular intervals to measure changes in metabolism and biomarkers of health. Statistical analysis would be used to determine if there are significant differences in health outcomes between the different groups.

40 - How does the level of UV radiation affect the growth and survival of plants?

Set up an experiment in which plants are grown under different levels of UV radiation. This could be achieved by using UV lamps of varying intensities or by placing the plants at different distances from a natural source of UV radiation, such as the sun. The growth rate, survival rate, and other relevant factors such as leaf size and chlorophyll content could be measured and compared across the different groups. This would help determine the impact of UV radiation on plant growth and survival. Control variables such as temperature, humidity, and watering would need to be carefully monitored and controlled to ensure accurate results.

41 - Investigating the effects of different types of drugs on human physiology and behavior.

Conduct a double-blind, randomized controlled trial with a group of participants who are given different types of drugs. The physiological and behavioral effects of the drugs would be measured through various tests and assessments, such as blood pressure, heart rate, cognitive function, and mood. The results would be analyzed to determine the impact of each drug on the participants' physiology and behavior, and any potential side effects or risks associated with each drug would be identified.

42 - How does the level of carbon dioxide affect the growth and development of plants?

Conduct an experiment in which plants are grown in controlled environments with varying levels of carbon dioxide. The growth rate, height, and biomass of the plants can be measured over a set period of time. The results can be compared to determine the impact of different levels of carbon dioxide on plant growth and development. Other variables such as light, temperature, and watering would need to be controlled to ensure that the results are accurate and reliable.

43 - Investigating the effects of different types of pesticides on non-target organisms and ecosystems.

Conduct a series of experiments in which different non-target organisms are exposed to varying concentrations of the pesticide. The organisms could be chosen based on their ecological importance, such as pollinators or soil microorganisms. The effects of the pesticide on the organisms could be measured by tracking their survival rates, reproductive success, or behavior. Additionally, the impact of the pesticide on the broader ecosystem could be assessed by monitoring changes in the abundance and diversity of other species in the area. Comparing the results of these experiments would provide insight into the potential ecological risks associated with the use of the pesticide.

44 - How does the level of atmospheric pollutants affect the growth and development of plants?

Set up an experiment in which plants are grown in controlled environments with varying levels of atmospheric pollutants, such as nitrogen dioxide or ozone. The growth rate, leaf area, and chlorophyll content of the plants could be measured over a set period of time. Comparing the growth rates and health of the plants exposed to different levels of pollutants would determine the impact of atmospheric pollutants on plant growth and development. Control variables such as light, temperature, and watering would need to be kept constant to ensure accurate results.

45 - Investigating the effects of different types of microorganisms on the digestive system and gut microbiome.

Conduct a study in which different groups of animals are exposed to different types of microorganisms, either through their diet or through direct exposure. The effects on their digestive system and gut microbiome could be measured through various methods such as analyzing fecal samples, measuring changes in gut pH, or monitoring the presence of certain bacteria. Comparing the results from the different groups would determine the impact of the microorganisms on the animals' digestive system and gut microbiome.

46 - How does the level of humidity affect the growth and survival of insects?

Conduct an experiment in which insects are exposed to different levels of humidity in a controlled environment. The survival rate and growth rate of the insects could be measured over a set period of time. The experiment would need to control for other variables such as temperature, food availability, and lighting. Comparing the survival and growth rates of the insects in different humidity levels would determine the impact of humidity on their growth and survival.

47 - Investigating the effects of different types of radiation on the genetic material and DNA replication.

Cultivate a sample of cells in a controlled environment and expose them to different types of radiation, such as gamma rays or UV light. The cells would then be monitored for changes in their genetic material, such as mutations or damage to DNA replication. The results could be compared to a control group that was not exposed to radiation to determine the effects of each type of radiation on the cells. Additional experiments could be conducted to investigate the long-term effects of radiation exposure on the cells.

48 - How does the level of soil salinity affect the growth and survival of plants?

Set up an experiment in which plants are grown in soil with varying levels of salinity. An appropriate range of salinity levels and a suitable plant species would need to be chosen, along with control variables such as light, temperature, and watering. The growth rate and survival rate of the plants could be measured by tracking their height, mass, and number of leaves over a set period of time. Comparing the growth and survival rates of the different groups would determine the impact of soil salinity on the plant's growth and survival. Additionally, the concentration of ions in the soil could be measured to determine the relationship between soil salinity and plant growth.

49 - Investigating the effects of different types of antibiotics on bacterial growth and antibiotic resistance.

Set up a series of petri dishes with agar and bacterial cultures. Each dish would contain a different antibiotic, with varying concentrations. The dishes would be incubated for a set period of time, and the growth of the bacteria would be measured. The results would show which antibiotics were most effective at inhibiting bacterial growth, and whether any resistance had developed. Control variables such as temperature, humidity, and the type of bacteria used would need to be carefully controlled to ensure accurate results.

50 - How does the level of soil pH affect the growth and survival of plants?

Conduct an experiment in which plants are grown in soil with varying pH levels. An appropriate range of pH levels and a suitable plant species would need to be chosen, along with control variables such as light, temperature, and watering. The growth rate of the plants could be measured by tracking their height or mass over a set period of time. Comparing the growth rates of the different groups would determine the impact of soil pH on the plant's growth and survival. Other factors such as nutrient availability and toxicity would also need to be considered and controlled for in the experiment.

51 - Investigating the effects of different types of hormones on animal behavior and physiology.

Conduct experiments with different groups of animals, each exposed to a different hormone. The behavior and physiology of the animals would be monitored and recorded over a set period of time. Control variables such as diet, environment, and age would need to be maintained across all groups. Comparing the results of the different groups would determine the effects of each hormone on the animals' behavior and physiology. Statistical analysis could be used to determine the significance of the results.

52 - How does the level of water availability affect the growth and survival of plants?

Conduct an experiment in which plants are grown in different levels of water availability, ranging from drought conditions to optimal watering. The growth rate, survival rate, and overall health of the plants would be monitored over a set period of time. The data collected would be used to determine the impact of water availability on plant growth and survival. Control variables such as light, temperature, and soil type would need to be kept constant to ensure accurate results.

53 - Investigating the effects of different types of plant extracts on bacterial growth and antibiotic resistance.

Prepare bacterial cultures in petri dishes with different concentrations of the plant extracts. The growth of the bacteria can be observed over a set period of time, and the effectiveness of the plant extracts in inhibiting bacterial growth and antibiotic resistance can be determined by comparing the growth rates of the different groups. Control variables such as temperature and nutrient availability would need to be kept constant to ensure accurate results.

54 - How does the level of nutrients affect the growth and development of microorganisms?

Conduct experiments in which microorganisms are grown in nutrient-rich and nutrient-poor environments. The growth rate and development of the microorganisms could be measured by tracking their population size and observing their morphology under a microscope. Comparing the growth rates and morphology of the microorganisms in the different environments would determine the impact of nutrient levels on their growth and development. Control variables such as temperature, pH, and oxygen levels would need to be kept constant.

55 - Investigating the effects of different types of pollution on the reproductive systems and fertility of animals.

Select a suitable animal species and expose them to different types of pollution, such as air pollution or water pollution. The reproductive systems and fertility of the animals could be monitored over a set period of time, and compared to a control group that was not exposed to pollution. The impact of the pollution on the animals' reproductive systems and fertility could be determined by analyzing factors such as the number of offspring produced, the health of the offspring, and any abnormalities or complications observed during pregnancy or birth.

56 - How does the level of light intensity affect the growth and development of microorganisms?

Set up multiple petri dishes with agar and different levels of light intensity, ranging from complete darkness to bright light. Inoculate each dish with the same strain of microorganisms and incubate them for a set period of time. The growth of the microorganisms can be measured by counting the number of colonies or by measuring the turbidity of the culture. Comparing the growth rates of the different groups would determine the impact of light intensity on the growth and development of the microorganisms. Control variables such as temperature, nutrient availability, and humidity would need to be maintained throughout the experiment.

57 - Investigating the effects of different types of food on the metabolism and energy balance of humans.

Conduct a randomized controlled trial in which participants are assigned to different groups and given different types of food to eat for a set period of time. The participants' energy intake, metabolism, and weight would be measured before and after the intervention to determine the impact of the different types of food on their energy balance. Other factors such as physical activity levels and sleep patterns would also need to be controlled for to ensure accurate results.

58 - How does the level of nutrients affect the growth and development of plants?

Conduct an experiment in which plants are grown in different nutrient solutions with varying levels of nitrogen, phosphorus, and potassium. The growth rate, height, and mass of the plants could be measured over a set period of time to determine the impact of the nutrient levels on their growth and development. Control variables such as light, temperature, and watering would need to be kept constant. The results could be analyzed to determine the optimal nutrient levels for plant growth and development.

59 - Investigating the effects of different types of hormones on plant growth and development.

Set up an experiment in which different groups of plants are treated with different types and concentrations of hormones. The growth rate, height, and mass of the plants could be measured over a set period of time. Control variables such as light, temperature, and watering would need to be kept constant. Comparing the growth rates of the different groups would determine the impact of the hormones on the plant's growth and development. Additional measurements such as leaf size, root length, and flower production could also be taken to further analyze the effects of the hormones.

60 - How does the level of water quality affect the growth and survival of aquatic organisms?

Set up multiple aquariums with varying levels of water quality, such as different levels of pollutants or pH. Introduce the same species of aquatic organism into each aquarium and monitor their growth and survival over a set period of time. The growth rate and survival rate of the organisms can be compared between the different aquariums to determine the impact of water quality on their growth and survival. Control variables such as temperature and feeding schedules should be kept consistent across all aquariums.

Remember to come up with your own original IA topic and check it with your teacher. It should be practical to conduct and relevant to the syllabus. Even A-Level Biology tutors say that this is a great opportunity to develop your personal interests, while advancing your knowledge of the Biology curriculum.

How can I prepare for the IA?

To prepare for the IA, students should ensure that they understand the material covered in their biology course and should practice writing lab reports. They should also seek feedback from their teachers on their writing skills and their understanding of the research process. IB tutors provide personalized guidance and can help students understand complex topics and achieve higher grades as well.

TutorChase's IB resources , including IB Biology Q&A Revision Notes , are perfect for students who want to get a 7 in their IB Biology exams and also prepare for the internal assessment. They are completely free, cover all topics in depth, also have IB Biology past papers and are structured by topic so you can easily keep track of your progress.

How is the IA graded?

The IA is worth 20% of the final grade for the IB biology course, whether you are studying at Higher or at Standard Level. It is graded by the student’s teacher, who is trained and certified by the International Baccalaureate organization. The report is then sent to a moderator, who will check that the report adheres to the IB guidelines and that the grade awarded is appropriate.

Online Biology tutors emphasise that it is important for students to be familiar with the assessment criteria for the biology internal assessment. These criteria are used to grade the laboratory report and reflective statement, and include aspects such as the quality of the research question, the methodology used, the data analysis, and the conclusion. Students should also make sure that their report is well-written and properly formatted, and that it includes all the required sections.

Source: IB Biology Subject Guide, pre-May 2025

In summary, the IA in the IB is an opportunity for students to demonstrate their understanding of the biology curriculum, as well as their ability to conduct independent research. It consists of a laboratory report and a reflective statement, and is worth 20% of the final grade for the course. To prepare for the assessment, students should ensure that they understand the material covered in their IB Biology.

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Written by: Charles Whitehouse

Charles scored 45/45 on the International Baccalaureate and has six years' experience tutoring IB and IGCSE students and advising them with their university applications. He studied a double integrated Masters at Magdalen College Oxford and has worked as a research scientist and strategy consultant.

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12 Examples and Tips for IB Biology IA

May 4, 2022 | IB subjects

IA is one of the many things IB students struggle with, but some might feel that writing the IA in Biology is especially confusing since it covers broad topics. This post is for those who are having a hard time coming up with a topic, are worried about writing the IA in Biology overall, or are interested in Biology but not so sure about taking it because of IA. An overview of the subject IB Biology can also be seen in a previous post: Exam Strategy for IB Biology (HL/SL) .

1. Overview of Biology IA

Both HL and SL students are expected to write an IA ( Internal Assessment ) in Biology which accounts for 20% of the final grade . The IA in biology is expected to be a 6-12 pages long report about an investigation a student carries out based on their own hypothesis.

1.1 IA Criteria

HL and SL share the same IA criteria and it’s important to understand the criteria before and while carrying out the investigation for your IA. (Reference: Biology Teacher Support Material )

2. Examples of Biology IA Topics

Many IB graduates have kindly answered an online survey by MakeSensei and given examples of IA topics in IB Biology. Some of them are RQs (Research Questions), so you might want to see the pattern of how they make RQs for your future IA.

• What is the effect of exposure to different concentration of sodium chloride solutions for different duration time on the germination percentage, mean germination time, and relative injury rate of Ipomoea aquatica?
• Lactic acid experiment in milk
• What is the effect of sodium chloride concentration (0.0, 0.4, 0.8, 1.2, 1.6, and 2.0 %) on the rate of hydrolysis of 1.0 % starch solution by 2.0 % ɑ-amylase (Bacillus subtilis), measured as the rate of decrease in absorbance value (Au s–1), using Spectrophotometer Vis at 434.2nm?
• Protein-digestive enzyme
• What is the effect of fertiliser quantity on evening levels of dissolved oxygen in river water samples over a period of two weeks?
• An Investigation into the Effect of Different Types and Concentrations of Pesticides (Orthoran Acephate, Kadan Safe, Kadan Plus DX) on Seed Germination: Observing Plant Growth of ErucaSativa, Brassica Oleracea, Lepidium Sativum and Perilla Frutescens
• An investigation into the effect of sodium chloride on plant germination and its growth.
• (Title: How to make delicious natto) RQ: What is the effect of pre-soaking time of soybeans, 0.00, 3.00, 6.00, 9.00, and 12.00 hours (±0.05 hours), on the length of threads between separated fermented soybeans (natto) measured by a clear plastic ruler (±0.1cm)?
• Effect of light intensity on the travel activity of a Physella acuta
• Investigating the effect of concentration of the salt solution on germination and growth of cotton and spinach seeds
• Investigating the correlation of the length of knee roots of a mangrove and the number of holes crabs make in the given area
• Effect of temperature on denaturation of albumin protein

3. Tips for Biology IA

3.1 Set Appropriate Independent/Dependent Variables

In order to carry out the investigation with sufficient sample size and trials, there needs to be independent and dependent variables that are both appropriate in terms of the purpose of your investigation. If you want to find out the relationship between X and Y (how X influences Y), then your independent variable should be X and your dependent variable should be Y. Both variables should be measurable , meaning quantitative, to allow various statistical analyses. But having qualitative data is valued in discussion as well.

3.2 The More Data, The Better

It is known that you should have at least 25 samples of data for your Biology IA, but let us explain why. While having multiple trials is necessary for the investigation, each trial should also have multiple samples. Therefore, 5 trials with 5 samples each make up 25 samples in total. Having said that, your sample size is up to you, and having more than 25 samples would only make your data more robust . But make sure you have enough time and energy to process the whole data.

3.3 Use Appropriate Secondary Sources

Doing background research on the field you’re focusing on in IA is required to back up your hypothesis, discussion, and conclusion. A lot of people use secondary sources (sources that are not first-hand) and most often through the internet. But, using Wikipedia or personal blogs would not be appropriate for your IA because they may not be reliable, accurate information. Instead, you might want to use these websites to search for previous academic articles and journals.

• Google Scholar
• The World Factbook  (provides you data about the country of your interest)

3.4 Don’t Forget Annotations and Citations

• Annotations

An annotation is a short comment written near an image to give an explanation. Annotations are necessary when the image and its title don’t give enough explanation to specific objects in the image and your word count is limited. For example, when you’re showing your method with an image of instruments, readers might not understand why you chose those instruments to carry out your experiment. To avoid such inconvenience, annotations provide more detailed information than the title and the main text.

A citation is a short version of the reference to your source and it needs to be in-text or footnote. Every time you mention something that is not original or first-hand, you need to put citation(s) to prove where that statement comes from. If you miss citations, it will be considered plagiarism and you could fail the IB. Therefore, citations are important!! You could use  Citation Machine  to create a reference list and citation for each reference (check which style is preferred by your teacher).

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IB Biology Internal Assessment Solved: A Guide to Acing Your Biology IA

What is a Biology IA?

The Biology Internal Assessment (IA) is a take home report on a research question of your choice. It is worth 20% of your final grade and thus it is important to perform well in it. The Biology IA can be daunting. It has a 16-page limit, which might seem like a lot to do, but towards the end of the IA you’ll be wishing you had more pages to work with. This guide is aimed to help you ace the IB Biology IA and to answer any questions you may have.

Choosing a Research Question

The most difficult part of the IA is choosing a research question. There are thousands of topics out there all of which are interesting. However unfortunately when conducting research, you are restricted to scope and the equipment which is available. Well how can you find a topic?

In order to find a topic, I would first choose a syllabus point which sounds appealing to you. Once you have found a syllabus point start googling experiments which have been conducted on that point. They do not have to be identical. DO NOT choose the first experiment you find. I would recommend collecting multiple experiments and read through all of them noting down how it was conducted and whether they had any unanswered questions.

These unanswered questions should be used as motivation when creating a research question. From here you can conduct further research to determine whether it is in the scope or not. If it is then you now have a research question to base your IA off. If it is outside the scope attempt to simplify the question or narrow the focus to that of which you can work with.

Conducting Research

Now that you have your research question it is time to gain background knowledge. Background knowledge is crucial as not only does it enhance your understanding of the topic, but it will be used in your IA to help the reader understand the topic.

When conducting research, the biggest mistake people make is using refutable sources. I would recommend using only published research articles as they have the most evidence to support their claims. This will enhance the reliability of your IA as information you are using is backed up by multiple sources. HOWEVER, it is crucial to ensure that you reference in APA format. We will explore referencing later in the article.

The research you gather should be used in your IA to explain to the reader the reasoning behind your question and to explain any concepts which may be confusing or abstract.

Undergoing the Experiment

Once you have conducted your research you are ready to create your method. The method you create to conduct the experiment is the same method you will place in your report. So, I would recommend that your method is detailed and concise. To ensure this, pretend that you are writing a method to someone who has never conducted an experiment before. This not only makes the method easy to follow for others, but for yourself too, ensuring that the experiment is conducted smoothly.

It is important that you conduct multiple trials. This will be explored in your evaluation as the more trials you conduct the more accurate and reliable your results become. However, when conducting multiple trials, try to conduct them during the same time period as it reduces the number of controlled variables.

Also, keep in mind that there is a possibility that the experiment may not work or that it may have varying results. If that occurs, do not stress, it is completely normal and will give you more to discuss later in the evaluation.

Writing the Report

Now for the fun part. Writing the report. When writing the report there are some sections which are more difficult than others. Below I will explore the sections most students find difficult to complete in a coherent manner.

Background Information

This section involves the most external information. Here you will collate all the information you have gathered on your research question and explore it. One key mistake students make is they do not systematically explore the information. I would recommend inserting subheadings for the various concepts you will explore, ie: 1.1: Photosynthesis, 1.2: electromagnetic spectrum, 1.3 Mentha spicata L, spearmint. Through using subheadings, it becomes easier for the marker to follow the report.

Paraphrase, Paraphrase & Paraphrase. One common mistake students make is that they “dump” information into their report and reference it. AVOID THIS. Instead, I would recommend paraphrasing information, explaining it and its relevance to the report.

Materials, Risks, Environment and Variables

Listing materials is easy and is probably the easiest part of the IA. However, many students do forget to insert the uncertainties for measuring instruments. This is very important as uncertainties must be explored in the weaknesses section for the IA.

Risk assessment should be included in the IA. It ensures that potential hazards which may arise during the experiment have been identified and precautions installed. It also ensures that if someone were to repeat the experiment, they are also aware of the dangers.

The experiments should all be ethical. Hence, environmental considerations should be addressed to show that ethical considerations were taken into account and methods were implemented to ensure the environment was not harmed.

All variables should be discussed in the report. This includes independent, dependent and controlled variables. When listing the variables, it should be discussed how they were controlled and why they should be controlled. This increases personal engagement, as it shows the marker that there was constant reflection being conducted.

Qualitative and Quantitative

When discussing results, both quantitative and qualitative results should be discussed. When discussing quantitative results, I would recommend using tables and graphs. It allows for clear and concise representation of information and allows for easier comparisons and discussions. Averages and standard deviation for the graphs and tables should be explored, as they allow for more accurate and justified conclusions to be drawn. Other tests such as t test, Tukey’s statistical difference test or chi squared test can be used to enhance the IA and discussion of results.

Qualitative analysis consists of differences which can be visually identified. Here you discuss differences in visual representation before the experiment was conducted to after the experiment.

Strength vs Weakness

Strengths: In this section I would recommend listing 2-3 strengths and commenting on how they affected the report or experiment.

Weaknesses: In this section I would recommend listing 5-6 weaknesses, and commenting on how they affected the report or experiment. You should then explore how you can improve this if you were to conduct the experiment again.

Further Questions

At the end of the IA, I would recommend including 2-3 further questions which could be explored if you had the opportunity. This improves personal engagement as it shows the marker that you have reflected on the current experiment and thought about what else you could explore.

Reference List (APA Format)

Ensure all in text references are listed at the end of the IA in APA format and alphabetical order. If this is difficult, I would recommend using the reference tab on a word document. Once you insert the information it converts it to APA format and will list it alphabetically for you.

Remember that the examiners are focusing on the detail of your report and your reflection. If you find that there was an error in the experiment, DISCUSS IT.

Best of luck for the Internal Assessment. You’ve got this!!

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30 IB Biology IA Topic Ideas!

Are you struggling with choosing your topic for your IB Biology IA? Don’t worry, we’ve all been there. Finding a topic is one of the – if not THE – most important part of writing your IA, so we want to make sure that you get it right! Luckily, there are so many great topics to choose from, and we’ve asked some of our top team to note down some topics that might inspire your own incredible research!

NOTE: These topics are purely meant as inspiration and are not to be chosen blindly. Even though many of these topics led to high scores for some of our graduates in the past, it is important that you listen to the advice of your subject teacher before choosing any topic!

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Biology ia ideas with independent variables

1, Look at the genetic similarities and differences between species, kingdoms, phylas, classes, genuses, orders, families, and domains.

2, Testing global warming: How does CO2, water vapour, oxygen, or any other variable affect  temperature inside a cutoff bottle exposed to simulated sunlight?

3, Describe how the primary productivity of algae changes with temperature, algae concentration, other aquatic plants, salinity, nutrients, and any other variables you may want to consider.

4, How does varying the gel concentrations of agarose affect DNA migration through a gel?

5, Effect of BMI on skin surface temperature in various body areas on rate of recovery once exposed to cold.

6, How does sudden change in body position affect heart rate and baroreceptor feedback?

7, How do the respiration rates of baker’s yeast and wine yeast in various sugar solutions compare?

8, How do the buffering actions of milk, yogurt, juices, detergents etc. compare?

9, Do our reaction times slow down with age?

10, Can we slow down the decaying times of vegetables? Can temperature, humidity, or exposure to sunlight affect how quickly vegetables decay?

Need inspo for Physics too? Check out some Physics IA ideas here !

11, What is the effect of the salt concentration on germination of different types of seeds?

12, What happens after the best-by date of dairy products?

13, Comparative study between 5 different species of animals using BLAST analysis to determine evolutionary history

14, What is the respective change of allele frequency when initial frequencies are manipulated?

15, Analysing the impact of river pollution on marine life.

16, Determine the effect of glucose concentration on the rate of osmosis.

17, What is the effect of pests on the diversity of plants in a lawn?

18, What is the effect of isotonic drinks on rehydration and recovery after exercise?

19, What is the difference in the CO2 levels exhaled before and after enduring physical exercise?

20, Testing the effectiveness of different types of toothpaste in inhibiting the growth of different types of bacteria.

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21, The effect of temperature / light on fruit ripening

22, Exploring stomatal density in a variety of conditions

23, Testing the effectiveness of toothpaste types

24, Investigating the effect of smoke water on the germination and growth of E.pilularis

25, Exploring the effect of sunlight on biomass

26, Exploring effect of light levels on the predation of the peppered moth

27, Investigating the effect of different light intensities on water weeds

28, How do different antibiotics interact with the process of seed germination?

29, Determining the effect of time on the plasmolysis of potatoes

30, Exploring mollusc shapes with regards to an external variable e.g. location on shore

So there we have it! 30 Biology IA topic ideas to get your lab report started! Still feeling a bit uneasy about the task ahead? Fear not, we have elite Biology tutors who can assist you through the process!

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Biology IA Examples: Exploring Interesting Projects

Biology Internal Assessments (IAs) are not just a part of the IB curriculum; they’re a golden ticket for students to dive headfirst into the fascinating world of scientific exploration. In this comprehensive guide, we’ll walk you through a variety of interesting Biology IA examples that go beyond the classroom, providing students with hands-on experiences that are both educational and fun.

Investigating Enzyme Activity:

Enzymes, those microscopic heroes in our cells, make biochemical reactions happen. For an engaging IA, students can explore how external factors influence enzyme activity. This might involve experimenting with varying temperatures to observe the effects on catalase activity in liver cells. By understanding these nuances, students not only unravel the complexities of enzymes but also gain insights into real-world applications.

Examining Plant Growth Responses:

Plants, often underestimated, are incredible organisms with complex growth responses. In a captivating IA project, students can experiment with different concentrations of plant growth hormones to decipher their impact on bean plant growth. This isn’t just about playing with plants; it’s a chance to uncover the regulatory mechanisms that govern plant development and growth.

Studying Microbial Growth:

Microbes, though tiny, wield substantial power in the biological landscape. IA projects focused on microbial growth open up a realm of possibilities. For example, investigating how antibacterial agents affect the growth of Escherichia coli or studying the influence of environmental factors on mold growth on bread provides valuable insights. These explorations not only contribute to our understanding of microbes but also have practical implications in fields like medicine and food safety.

Investigating Genetic Inheritance:

Genetics , the code of life, is a playground for exciting IA projects. Students can delve into genetic traits using model organisms like fruit flies, unraveling the principles of inheritance. Alternatively, exploring the distribution of blood types in a specific population unveils the intricacies of genetic inheritance. These projects not only enhance genetic literacy but also allow students to actively contribute to ongoing genetic research.

Analyzing the Impact of Environmental Factors

Ecology comes to life in IA projects examining the relationship between organisms and their environment. By experimenting with environmental factors such as pollution or habitat changes, students can uncover their impact on population dynamics. A compelling IA might involve studying the effects of different pollutants on the growth of aquatic microorganisms, providing valuable insights into the delicate balance of ecosystems.

Investigating Human Physiology:

Our own bodies are a treasure trove of mysteries. IA projects in human physiology can focus on systems like the heart, lungs, or senses. For instance, studying the effects of exercise on heart rate or exploring the connection between taste perception and genetic variations offers a window into the intricate workings of the human body. These projects not only deepen our understanding of human biology but also have implications for health and well-being.

Conclusion:

Biology IAs offer more than just grades; they offer a chance for students to actively engage with science. The examples explored in this guide highlight the vast possibilities within the realm of Biology IAs, showcasing how students can not only grasp theoretical concepts but also contribute to the broader scientific community. As students embark on these investigative journeys, they’re not just students – they’re budding scientists uncovering the mysteries of the biological world.

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22 Biology IA Topic Ideas

Written By IB++ Tutor Zohaib N.

Internal Assessment

The internal assessment requirements are the same for biology, chemistry and physics. The internal assessment, worth 20% of the final assessment, consists of one scientific investigation. The individual investigation should cover a topic that is commensurate with the level of the course of study. Student work is internally assessed by the teacher and externally moderated by the IB. The performance in internal assessment at both SL and HL is marked against common assessment criteria, with a total mark out of 24.

The task will have the same assessment criteria for SL and HL. The five assessment criteria are personal engagement, exploration, analysis, evaluation and communication.

Internal assessment criteria the new assessment model uses five criteria to assess the final report of the individual investigation with the following raw marks and weightings assigned:

• Personal engagement 2 (8%)
• Exploration 6 (25%)
• Analysis 6 (25%)
• Evaluation 6 (25%)
• Communication 4 (17%)
• Total 24 (100%)

Here is a list of top 22 Biology Internal Assessment (IA) ideas:

• How do the factors temperature and light intensity that affect photosynthesis balance out each other when it comes to the time taken for photosynthesis to occur?
• How does increasing the concentration of Oxytetracycline in mg/L affect root elongation in cm of Citrus limon?
• How does cumin and turmeric powder, in comparison to indigestion tablets, affect the rate of neutralization of hydrochloric acid, measured by the difference of change of pH levels in 5 minutes?
• How does different concentrations of Gibberellic acid affect the germination of a dolly Parton rose?
• To what extent does the mass of sodium nitrate powder have an effect on the quality of beef as a preservative
• How does different sodium chloride concentrations affect seed germination in the bougainvillea plant?
• How does different conditioners affect the strength of hair?
• How does extract of the seeds and the leaves of the moringa plant (herbal medicine) show antifungal activity against the Malassezia yeast (Pittosporum) fungi that causes dandruff?
• How does the concentration of zinc chloride affect the growth of plaque?
• How effective are synthetic antibacterial products compared to natural antibacterial products against the growth of Cut bacterium acnes?
• What brand of laundry detergent is the most effective in the digestion and removal of lipid stains?
• How does the pH level of watering solution affect the growth and development of chickpea (Cicer arietinum) and mung bean (Vigna radiata) over a time period of 5 days indicated by the length of the stem measured?
• How would changing (storage) temperatures affect the rate of change of pH of different types of milk due to spoilage?
• How does the acidity of different beverages affect the deterioration of tooth enamel? (Use egg as imitation of tooth)
• How does a sudden and intensive workout affect the heart rate, and to what extent does warm up have an impact on the maximum heart rate?
• How do different concentrations of lactases affect the breakdown of disaccharides like lactose in milk effectively?
• How does the composition of soil affect the growth of runner Plants from the original plant?
• How does stomatal density change according light exposure of red and blue light?
• How does the percentage of salinity in water affect the rate of growth of radishes in mass?
• How do natural antiseptics (ginger and turmeric) compare with commercial antiseptics in the inhibition of growth of e. coli bacteria?
• What effect does temperature have on the ripening process of a fruit?”
• Investigate the influence of Ph levels in the soil on the development of the Lepidium avitum 2) How does the concentration of potassium chloride affect the growth of Lepidium savitum.
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50 Biology IA Topics: Essential Selections for Learners

What is Biology IA

What are the Essential Components of the IA

Biology IA Topics

How Can I Prepare for a Biology IA

Final words.

I've witnessed firsthand the transformative power of engaging with the right research question in biology. Drawing from years of experience and a deep understanding of the subject, I've curated a list of 50 Biology IA topics to guide students and researchers alike. This compilation is more than just a list; it's a bridge connecting curious minds to the vast and intricate world of biological sciences. Each topic has been carefully selected for its potential to challenge, inspire, and contribute to our growing body of knowledge. Whether you're exploring the microscopic intricacies of cell biology or the complex ecosystems that sustain life on Earth, these topics are designed to foster a profound appreciation for the living world and its phenomena.

What is Biology IA (Internal Assessment) ?

The IA involves the submission of a lab report by students as part of their IB biology curriculum. Until May 2025, the report must be between 6 and 12 pages, encompassing a research question, methodology, data analysis, and a conclusion. Starting from May 2025, the report's length will be capped at 3,000 words.

IA should begin with a research question that is not only testable but also deeply rooted in the biology syllabus. This question must be closely aligned with the curriculum, precisely defined, and specific. In the methodology section, a detailed account of the research process, including the materials and methods utilized, should be provided. This section must be thorough, clearly describing the research steps, resources employed, and any ethical considerations addressed. Analyzing the gathered data is a critical phase of the IA. Students are expected to organize their data neatly and apply suitable statistical methods for analysis, interpreting their findings accurately. They should also discuss any study limitations and the broader significance of their results. The conclusion should encapsulate the study's key outcomes, linking them directly to the initial research question, and suggest areas for future investigation. Moreover, students must submit a reflective statement as part of their IA. This narrative, approximately 500 words, should ponder the student's learning journey throughout the IA process. It should cover the student's personal experiences, highlighting both triumphs and obstacles faced, assess their performance and the competencies developed during the assessment, and provide a thoughtful evaluation of the entire experience. Throughout this process, students may find tools like " essay typer free " helpful in articulating their thoughts and insights effectively.

List of 50 Biology IA Topics

• Deep Dive into the Syllabus: Start by thoroughly understanding the IB Biology syllabus. Knowing the curriculum inside out helps you identify areas that interest you and align with the IA requirements. It also ensures that your research question is relevant and grounded in the course content.
• Practice Lab Report Writing: Enhance your lab report writing skills by practicing regularly. Familiarize yourself with the structure and conventions of scientific writing. Pay special attention to clarity, coherence, and the logical flow of information. Consider reviewing exemplar lab reports and seeking constructive feedback from teachers or peers.
• Seek Feedback Early: Don't wait until your IA is fully developed to seek feedback. Discuss your ideas, research question, and methodology with your biology teacher or an IB tutor early in the process. Regular feedback can help refine your approach, identify potential pitfalls, and ensure your project is on the right track.
• Master Data Analysis Techniques: A significant part of the IA is analyzing the data you've collected. Brush up on your statistical skills and familiarize yourself with software or tools that can aid in data analysis. Understanding how to interpret your results accurately is crucial for drawing meaningful conclusions.
• Reflect on Your Learning: The IA is not just about demonstrating your knowledge of biology; it's also an opportunity to reflect on your learning process. Engage in self-reflection throughout your IA journey, noting what you've learned, challenges you've encountered, and how you've overcome them. This reflective practice not only enhances your IA but also contributes to your personal growth as a learner.
• The Effect of pH on Enzyme Activity: Investigate how different pH levels affect the activity of a specific enzyme, such as catalase found in potato cells. You'll need pH buffers, potato extract, hydrogen peroxide, and a spectrophotometer to measure the reaction rate. This experiment explores how enzyme function is influenced by pH, demonstrating the importance of homeostasis in biological systems.
• Photosynthesis Rate under Different Light Colors: Examine how light color affects the rate of photosynthesis using aquatic plants like Elodea. You'll need light sources of different colors, a carbon dioxide indicator solution, and a timer. By measuring oxygen production or CO2 consumption, students can understand how light wavelength influences photosynthetic efficiency.
• The Effect of Temperature on Bacterial Growth: Explore how temperature impacts the growth rate of bacteria such as E. coli. Required materials include bacterial cultures, nutrient agar plates, incubators set at different temperatures, and a colony counter. This experiment highlights the importance of temperature in microbial ecology and food safety.
• Plant Growth in Different Soil Types : Investigate how various soil types affect plant growth. You'll need seeds (such as beans), different types of soil (sand, clay, loam), pots, and a ruler to measure growth. This study can reveal the importance of soil composition on plant health and yield, essential for agriculture and ecology.
• The Impact of Salt Concentration on Seed Germination: Study how varying salt concentrations in water affect the germination rate of seeds like radishes. Materials include seeds, petri dishes, filter paper, and salt solutions of different concentrations. This experiment simulates the effects of soil salinity on plant life, relevant to understanding agricultural challenges and ecosystem responses to salinity.
• Caffeine's Effect on Daphnia Heart Rate : Examine the impact of different caffeine concentrations on the heart rate of Daphnia magna. You'll need a microscope, Daphnia, caffeine solutions, and a stopwatch. This experiment introduces students to the physiological effects of stimulants and the concept of dose-response relationships in pharmacology.
• The Role of Light Intensity on Plant Stomatal Density: Investigate how varying light intensities affect stomatal density in leaf specimens. Necessary materials include leaves from plants grown under different light conditions, a microscope, and clear nail polish for leaf impressions. This study explores how plants adapt to their light environments, affecting gas exchange and water loss.
• Antibiotic Resistance Spread in Bacteria: Explore how antibiotic resistance spreads among bacterial populations. Use antibiotic discs, bacterial cultures, nutrient agar, and an incubator. This experiment demonstrates the mechanism of natural selection and the importance of antibiotic stewardship in healthcare.
• The Effectiveness of Natural vs. Synthetic Antibacterials: Compare the antibacterial efficacy of natural substances (e.g., garlic, honey) versus synthetic antibacterials (e.g., commercial disinfectants). Materials include bacterial cultures, nutrient agar plates, paper discs soaked in antibacterial solutions, and an incubator. This topic highlights the potential of natural substances in fighting bacteria and the concept of antibiotic resistance.
• The Influence of Music on Plant Growth: Investigate the effect of different types of music on plant growth rates. You'll need plants, speakers, and various genres of music. By measuring growth over time, this experiment can explore the intriguing possibility of sound waves affecting plant physiology.
• Osmosis in Potato Tissue: Examine how osmotic balance is affected by salt or sugar solutions using potato strips. Materials include potato strips, various concentrations of salt or sugar solutions, and a balance. This simple yet effective experiment teaches the principles of osmosis and cell membrane permeability.
• The Impact of Different Fertilizers on Algae Growth: Study how various fertilizers influence algae proliferation in water samples. Required materials include water samples, different types of fertilizers, and a light source. This experiment highlights the issue of nutrient pollution and eutrophication in aquatic ecosystems.
• The Role of Mycorrhizal Fungi in Plant Growth: Investigate the impact of mycorrhizal fungi on the growth of plant roots. Materials include plant seedlings, mycorrhizal fungi inoculum, and soil. This study sheds light on the symbiotic relationships in ecosystems and their importance for plant nutrition.
• The Effect of Acid Rain on Plant Growth: E xamine how simulated acid rain (using solutions of different pH levels) affects the growth of plants. Materials include seedlings, pH-adjusted water solutions, and growth measurement tools. This experiment explores environmental stressors on plants and the broader implications of pollution.
• Genetic Diversity in Plant Leaf Morphology: Analyze the genetic diversity within a plant species by comparing leaf morphology. You'll need leaves from various individuals of the same species, a scanner or camera, and image analysis software. This project introduces concepts of genetic variation and its observable effects in populations.
• The Effects of Microplastics on Brine Shrimp Survival: Investigate the survival rate of brine shrimp in water with varying concentrations of microplastics. Use brine shrimp, microplastic particles, and tanks. This study highlights environmental issues and the impact of pollutants on aquatic life.
• Comparing Plant Transpiration Under Different Humidity Levels: Examine how different environmental humidity levels affect plant transpiration rates. Materials include plants, plastic bags to create humidity conditions, and a balance to measure water loss. This experiment explores plant water relations and adaptations to environmental stress.
• The Influence of Mobile Phone Radiation on Seed Germination: Study the effect of electromagnetic radiation from mobile phones on the germination rate of seeds. You'll need seeds, mobile phones, and controlled germination environments. This project investigates the potential impact of technology on biological processes.
• Assessing Vitamin C Degradation in Fruit Juices Over Time: Measure the degradation of vitamin C in various fruit juices stored at different temperatures over time. Use fruit juices, vitamin C test strips or a titration kit. This experiment explores nutrient stability and the factors affecting it.
• The Impact of Exercise on Human Heart Rate Recovery: Analyze how different intensities of exercise affect heart rate recovery in humans. Materials include a heart rate monitor, stopwatch, and volunteers. This study sheds light on cardiovascular fitness and physiological responses to exercise.
• Soil pH and Its Effect on Earthworm Activity: Investigate how varying soil pH levels affect the activity and distribution of earthworms. Materials include soil samples with different pH levels, earthworms, and observation containers. This experiment highlights soil health and biodiversity.
• The Role of Water Temperature in Goldfish Metabolism: Examine how changes in water temperature affect the metabolic rate of goldfish, using water baths, thermometers, and oxygen probes. This study explores ectothermic metabolism and environmental adaptations.
• Investigating the Allelopathic Effects of Plant Extracts on Seed Germination: Study how extracts from certain plants inhibit or promote the germination of seeds from other plants. Use plant extracts, seeds, petri dishes, and filter paper. This experiment delves into plant interactions and chemical ecology.
• The Effects of Different Light Intensities on Daphnia Heart Rate: Analyze how light intensity influences the heart rate of Daphnia magna, using a microscope, light sources with adjustable intensity, and a stopwatch. This explores the effects of environmental stimuli on physiological responses.
• The Efficacy of Various Water Purification Methods on Bacterial Content: Compare the effectiveness of different water purification techniques in reducing bacterial content. Materials include contaminated water samples, purification methods (filtration, boiling, chemical treatment), and agar plates for bacterial culturing. This study is relevant to public health and sanitation.
• The Impact of Aeration on Water Quality and Aquatic Life: Investigate how different levels of water aeration affect the quality of water and the health of aquatic organisms. Use tanks, aerators, water quality test kits, and aquatic plants or animals. This experiment highlights the importance of oxygen in aquatic ecosystems.
• Studying the Biodegradation Rate of Various Organic Materials: Compare the biodegradation rates of different organic materials under the same environmental conditions. Materials include organic substances (food scraps, paper, etc.), soil, and compost bins. This project emphasizes sustainability and waste management.
• The Effect of Light Wavelengths on Algae Photosynthesis: Examine how different wavelengths of light affect the photosynthesis rate of algae, using colored filters, light sources, and a CO2 indicator. This study contributes to understanding photosynthetic efficiency and light energy utilization.
• Insect Biodiversity in Different Habitats: Assess insect biodiversity across various habitats using pitfall traps, sweep nets, and identification guides. This project explores biodiversity, ecosystems, and the importance of conservation.
• The Influence of Sugar Types on Yeast Fermentation: Investigate how different types of sugar (glucose, fructose, sucrose) affect the fermentation rate of yeast, using yeast cultures, sugar solutions, and gas collection methods. This experiment explores cellular respiration and biochemistry.
• Assessing the Impact of Noise Pollution on Plant Growth: Study how different levels of noise pollution affect the growth of plants, using speakers to simulate noise conditions and measuring plant growth parameters. This investigates environmental stressors and plant responses.
• The Role of Antioxidants in Preventing Apple Browning: Examine the effectiveness of various antioxidants (lemon juice, vitamin C solution) in preventing the browning of apple slices, comparing treated and untreated samples. This explores oxidation reactions and food preservation methods.
• The Effect of Different Substrates on Worm Composting Efficiency: Compare the composting efficiency of worms in different substrates (paper, vegetable scraps, mixed organic material), measuring decomposition rate and soil quality. This highlights sustainable waste management and soil health.
• Exploring Plant Cloning Techniques in Potato Tubers: Investigate the efficiency of different plant cloning techniques using potato tubers, focusing on methods like cutting and grafting, and assessing growth success rates. This introduces genetic replication and agricultural practices.
• Studying the Effectiveness of Sunscreen in Blocking UV Radiation: Compare the effectiveness of different SPF sunscreens in blocking UV radiation using UV-sensitive beads or paper, highlighting the importance of sun protection and skin cancer prevention.
• The Impact of Sleep Deprivation on Cognitive Function in Students: Examine the effects of varying degrees of sleep deprivation on cognitive functions such as memory and reaction time in student volunteers, using cognitive tests and questionnaires. This explores human physiology and health science.
• Investigating the Rate of Water Absorption in Different Soil Types: Study how various soil types (clay, sand, loam) absorb water, using soil samples, water, and measuring equipment. This experiment is relevant to agriculture, gardening, and environmental science.
• The Effect of Magnetic Fields on Plant Growth: Explore the influence of different strengths of magnetic fields on the growth and development of plants, using magnets and plant specimens. This investigates electromagnetic effects on biological systems.
• Assessing the Antifungal Properties of Plant Extracts: Examine the antifungal efficacy of various plant extracts against fungal pathogens in plants, using fungal cultures, plant extracts, and agar plates. This study has implications for natural disease management in agriculture.
• The Influence of Carbon Dioxide Levels on Plant Growth: Investigate how varying concentrations of CO2 affect the growth rate of plants, using controlled environments with adjusted CO2 levels. This experiment is relevant to studies on climate change and plant physiology.
• Exploring the Effects of Different Pollutants on Microbial Soil Health: Assess the impact of various pollutants (oil, pesticides, heavy metals) on the microbial health of soil, using soil samples, pollutants, and microbial culture techniques. This highlights environmental pollution and ecosystem health.
• The Role of Salinity in Fish Osmoregulation: Study how different salinity levels in water affect the osmoregulation mechanisms of fish, using aquariums, salinity meters, and fish specimens. This experiment explores marine biology and physiological adaptations.
• Investigating the Effects of Urbanization on Bird Populations: Compare bird species diversity and population numbers in urban versus rural areas, using birdwatching techniques and data analysis. This project examines biodiversity loss and conservation in changing environments.
• The Impact of Different Cooking Methods on Vegetable Nutrient Content: Examine how boiling, steaming, and microwaving affect the nutrient content of vegetables, using cooking equipment, vegetables, and nutrient testing kits. This explores nutrition science and food preparation methods.
• Assessing the Effectiveness of Different Handwashing Techniques: Investigate the bacterial reduction efficacy of various handwashing techniques and products, using bacterial cultures, agar plates, and volunteers. This is crucial for public health and hygiene education.

For optimal preparation for the IA, students must have a solid grasp of the biology course content and hone their lab report writing skills. They should actively seek their teachers' input on their writing abilities and comprehension of the research methodology.

Deep Dive into the Syllabus:  Thoroughly understand the IB Biology syllabus. Knowing the curriculum inside out helps you identify areas that interest you and align with the IA requirements. It also ensures that your research question is relevant and grounded in the course content.

Practice Lab Report Writing:

• Enhance your lab report writing skills by practicing regularly.
• Familiarize yourself with the structure and conventions of scientific writing.
• Pay special attention to clarity, coherence, and the logical flow of information.
• Consider reviewing exemplar lab reports and seeking constructive feedback from teachers or peers.

Seek Feedback Early:  Don't wait until your IA is fully developed to seek feedback. Discuss your ideas, research question, and methodology with your biology teacher or an IB tutor early in the process. Regular feedback can help refine your approach, identify potential pitfalls, and ensure your project is on the right track.

Master Data Analysis Techniques:  A significant part of the IA is analyzing your collected data. Brush up on your statistical skills and familiarize yourself with software or tools to aid data analysis. Understanding how to interpret your results accurately is crucial for drawing meaningful conclusions. ‍

Reflect on Your Learning:  The IA is not just about demonstrating your knowledge of biology; it's also an opportunity to reflect on your learning process. Engage in self-reflection throughout your IA journey, noting what you've learned, your challenges, and how you've overcome them. This reflective practice not only enhances your IA but also contributes to your personal growth as a learner.

As we wrap up our exploration of these Biology IA topic ideas, I hope you've found inspiration and a starting point for your investigative journey. Each topic offers a unique opportunity to delve into the wonders of the biological world, challenging you to ask questions, seek answers, and contribute to our collective understanding of life's intricacies. Remember, the key to a successful IA lies in choosing a topic that interests you and approaching it with curiosity, diligence, and a scientific mindset. Happy researching, and may your IA journey be as enlightening as it is rewarding!

Biology HL IA Examples

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Investigation Of The Effect Of Ethanol Concentration On Catalase Activity

Explore How Ethanol Concentration Affects Catalase Activity In This Detailed IB Biology HL Sample IA. Enhance Your Understanding And Boost Your Grades Now!

Effect Of Disinfectants Used As Floor Cleaners On The Growth Of Plants

Discover How Disinfectants Used As Floor Cleaners Impact Plant Growth. This IB Biology HL IA Sample Reveals Surprising Results And Innovative Analysis Techniques.

Inhibition Of Catechol Oxidase Enzyme In Bananas By Heavy Metals

Explore The Impact Of Heavy Metals On Bananas' Catechol Oxidase Enzyme In This Detailed IB Biology HL IA Sample. Discover Key Findings And Methodologies!

Effect Of pH On The Action Of Gibberellin In The Growth Of Shoot Height Of Green Chilli

Explore How pH Affects Gibberellin Action on Green Chilli Shoot Growth in This IB Biology HL IA Sample for Detailed Insights and Effective Study Strategies.

An Investigation Into The Effect Of Water Velocity On The Abundance Of Freshwater Shrimp (Gammarus Pulex) In The “Baye De Clarens” River’s Riffles.

Unlock the secrets of freshwater ecosystems! Explore the impact of water velocity on shrimp abundance in the "Baye de Clarens" river. Dive into our IB Biology HL IA sample now.

Exploring The Effect That Invasive Populus Alba Has On The Growth Of Native Celtis Africana In South Africa

Discover How Invasive Populus Alba Impacts The Growth Of Native Celtis Africana In South Africa. Gain Insight Into This Critical Study For IB Biology HL.

Antibacterial Property Of Mouthwash Solution

Discover The Antibacterial Power Of Mouthwash Solutions In This IB Biology HL IA Sample. Gain Insights And Improve Your Grades With This In-Depth Analysis.

Investigation On The Effect Of Natural & Synthetic Shampoos On The Tensile Strength Of Hair

Discover The Impact Of Natural And Synthetic Shampoos On Hair Strength In This Detailed IB Biology HL Sample IA. Ideal For Students Seeking Insightful Research.

Effect Of Source Of Starch On Action Of Starch Blockers

Discover How Different Starch Sources Impact The Effectiveness Of Starch Blockers In This Comprehensive IB Biology HL Internal Assessment Sample.

Effect Of Type Of Sugar On Rate Of Cellular Respiration In Yeast

Discover How Different Sugars Impact Yeast Respiration Rate. A Comprehensive IB Biology HL IA Sample For Top-Notch Insights And A+ Grade Inspiration.

Effect Of Concentration Of Enzyme (Pectinase) On Volume Of Juice Extracted From Red & Green Apples

Unlock The Secrets Of Enzymes: Explore How Pectinase Concentration Affects Juice Volume In Red And Green Apples With This Sample IB Biology HL IA.

Effect Of Varying Amounts Of Burnt Boswellia Frankincense Stick Gases On Refractive Index (%) Of Sugar In Sapodilla

Discover the impact of burnt frankincense gases on sapodilla sugar's refractive index with this comprehensive ib biology hl sample ia. Learn and excel today!

Effect Of Salinity On Growth Of Plant

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Effect Of Concentration & Biological Variety On Percentage Activity Of Pectinase

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Effect Of Phytotoxicity Of Allelopathic Extracts On Growth Of Various Plant Species

Discover How Allelopathic Extracts Impact Plant Growth In This IB Biology HL IA Sample. Enhance Your Understanding Of Phytotoxicity And Plant Species Interaction.

Efficacy Of Turmeric As A Preservative On Tomatoes

Discover The Power Of Turmeric In Preserving Tomatoes With This Sample IB Biology HL IA. Unveil Scientific Insights And Boost Your Grades Now.

To What Extent Does Porn Addiction Affects The Individual & Relationships?

Discover How Porn Addiction Impacts Individuals And Relationships In This Comprehensive IB Biology HL Sample IA, Exploring The Depths Of Human Behavior And Psychology.

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5 New IB Biology IA Ideas (Updated Feb 2023)

Internal Assessment (IA) for International Baccalaureate (IB) Biology is a critical component of the IB Biology curriculum. It gives students a chance to show what they’ve learned by doing independent research and analysis. As students go through the IB Biology program, they have to make an IA project to show their skills and knowledge. With so many choices, it can be tough to pick the right topic for your IA project. But don’t worry, this blog post is here to help! We’ll give you a bunch of great IB Biology IA ideas, with all the details you need to get started, like independent and dependent variables and research questions. These ideas cover topics like plant biology, human physiology, and ecology, so there’s something for everyone. Whether you’re an old pro or a beginner, these ideas will give you a great foundation for your research and help you make a really amazing IA project.

How to Select the Right IB Biology IA Idea?

When selecting a topic for your IB Biology IA, it is important to approach the process with careful consideration. Your chosen topic should align with the requirements of the IB Biology curriculum, be relevant to current scientific research, and allow you to demonstrate your understanding of the subject matter. To increase your chances of achieving a level 7 score , consider the following recommendations: choose a topic that is appropriately focused, yet offers scope for sufficient data analysis; select a topic that permits you to apply scientific methodologies and exhibit critical thinking skills; and choose a topic that can be related to real-world situations or current biological issues. Furthermore, it is crucial to thoroughly research your topic and ensure that sufficient data and information is available to support your findings. To maximize your chances of success, it is advisable to seek guidance from your teacher or one of our IB Biology Tutors , and consult relevant scientific journals or websites.

5 Updated IB Biology IA Ideas (Feb 2023)

1. the influence of ambient conditions upon the process of photosynthesis:.

Independent variable: Environmental factors (such as temperature, light intensity, atmospheric CO2 concentration)

Dependent variable: The rate of photosynthesis in a specified plant species

Research question: “To what extent do variations in environmental conditions impact the velocity of photosynthesis in a particular plant species?”

2.  The effect of substratum on seed germination:

Independent variable: Type of substrate (such as soil, sand, cotton)

Dependent variable: Germination rate of a designated plant species

Research question: “In what manner does the selection of substrate affect the germination rate of a specific plant species?”

3. The relationship between substrate concentration and enzyme kinetics:

Independent variable: Substrate concentration

Dependent variable: Reaction rate of a selected enzyme

Research question: “To what extent does substrate concentration alter the rate of reaction of a specified enzyme?”

4. The absorption of water by plants as influenced by soil moisture:

Independent variable: Soil moisture level

Dependent variable: Water uptake by a specified plant species

Research question: “To what extent does soil moisture level impact the rate of water uptake in a particular plant species?”

5. Plant morphology:

Independent variable: Plant species

Dependent variable: Leaf size, shape, and structure

Research question: “What is the effect of plant species on the size, shape, and structure of leaves?”

IB Biology IA Ideas Final Thoughts

So, to wrap things up – the IB Biology IA is a real opportunity to challenge and grow as a student. By diving into exciting topics like plant biology, human physiology, and ecology, you get to explore the subject on a deeper level and flex your research and critical thinking muscles. The ideas in this blog post are just the beginning – it’s up to you to use them to spark your own creative and original IA project. And with the right approach – careful planning, research, and analysis – you’ll be able to show off your passion for biology and boost your academic success. So go ahead, get started, and take your IB Biology IA to the next level!

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[Group 4] 12 BIOLOGY IA EXAMPLES** + help me w/ my research question plsplsplspls

I spent half this damn summer scanning thru the interwebs for all kinds of biology related EE and IAs, so stick around for some pretty amazing examples that I put together, but I also have a few questions regarding my experiment,

my research question is " How does NaCl concentrations affect yeast metabolism on 4 different saccharides: glucose, fructose, galactose, and maltose? "

i've basically combined 2 research questions (NaCl on yeast metabolism & different sugars on yeast metab.), so now i have 2 independent variables on my hands, do you guys think this is a smart choice? does IAs even matter that much? I felt that it was too simple by themselves. and if anyone knows how to measure yeast metabolism (it's ethanol fermentation so it produces CO2) pls inform me as well.

as promised, here's a list of potential IAs and EEs that i've gathered.

How does heat affect acidity in brewed coffee (more chem tho + do not take this if you're from west coast canada !!)

sulfuric acid on photosynthesis of Cambomba

how does pH level / or concentrations of pH affect denaturation of protein casein in cheesemaking? (this was my group 4 but now its yours), you can also tilt this to other milky solutions: coconut milk, kefir.

how does water affect the texture of tofu during production?

just look into tofu in general

salting in, salting out (also a little chem)

denaturation of soymilk via heat vs via pH change

secondary macronutrients (sulfur, calcium, magnesium) on plant resource allocation / biomass. don't put calcium directly into water, 10/10 would NOT recommend

study into whey / casien proteins

NaCl effect on bamboo growth (fast growing for those collecting data over summer)

the effect of PRUNING on plant growth

phototropism

how does amount of sunlight exposure affect luminosity of bioluminescent dinoflagellates?

i know some of these examples are super vague and don't have a variable but i struggle with finding those, but hopefully, they were helpful! good luck yall, hope everyone gets an 35+!

P.S, if anyone knows where to get a VETEMENTS POLIZEI rain coat help ya boy out <3

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Biology IA Topics: 20+ Great Ideas to Get You Started

by  Antony W

September 5, 2022

There’s nothing worse than trying to brainstorm and search for Biology IA topics only to come out empty.

The problem is:

There’s a lot to explore in Biology that it proves challenging to determine what topic would be suitable to investigate from the hundreds of possible options. So if you’re having a difficult time figuring out what topic to explore, we can understand.

In this post, we’ll share a list of the best IB Biology IA topics that you can use either for inspiration to help you come up with a topic of your own or as a modified topic for further research.

Biology Internal Assessment Writing Help

Don’t enough time left to complete your Biology IA and don’t know what to do? 

Use  our Internal Assessment writing service   to get professional academic writing help from our team. Our writers are experts in writing IAs, and we guarantee high quality assignments that earn top marks.

IB Biology Internal Assessment (IA) Topics

Coming up with an IB Biology IA topic to explore isn’t difficult if you understand the requirements. Like Physics and Chemistry ,  your IA in Biology must focus on scientific writing and research in the Biology subject.

Below is a list of 30+ topic ideas for Biology Internal Assessment:

• Assessment of the effect of temperature on the vitamin C content of various juices
• What effect can quick shifts in body posture have on baroreceptor feedback and pulse rate?
• How do detergents, drinks, yogurt, and milk stack up when it comes to buffering?
• How does the ideal pH affect the growth rate of pinto and green beans? Proven Through Experiment
• The temperature dependence of the activation energy released during the decomposition of H2O2 utilizing the catalase enzyme and aluminum inhibitor as catalysts.
• To what extent does organic household waste affect the germination and emergence of tomato seeds?
• Investigating the Role of Carbonated Drink Volume and pH in Tooth Erosion/Decay
• In vitro Studies of Aluminum Chloride's Effects on the Liver Catalase Enzyme's Degradation of Hydrogen Peroxide
• Changes in seashell mass and carbon monoxide (CO) emitted during the reaction as a function of HCL concentration
• Does river pollution threaten the source of water for marine life?
• Fruit ripening as influenced by environmental factors including light and temperature
• How can we evaluate the respiration rates of wine yeast and baker's yeast in various sugar solutions?
• What happens to DNA movement as the concentration of the agarose gel changes?
• Compare the top and bottom 25 nations in terms of HDI and their rates of lung cancer-related mortality using secondary data.
• How does body mass index (BMI) affect the skin's surface temperature and the pace at which it recovers after exposure to cold?
• Hydrogen peroxide breakdown rate influenced by presence of various metal ions (H,O.).
• Using the Silver Nitrate titration method, how much variation exists between the chlorine concentrations (mg / L) of several locally accessible brands of treated water?
• How post-workout use of energy drinks affects cardiovascular function and blood pressure
• How do energy drinks affect blood pressure and heart rate following exercise?
• How do varying amounts of lactases affect the efficiency with which lactose and other disaccharides in milk are digested?
• Is there a correlation between the presence of home furnishings and stunted plant development?
• In terms of the pace of hydrochloric acid neutralization, as assessed by the difference in change in pH levels in 5 minutes, how do cumin and turmeric powder compare to indigestion tablets?
• What effect does zinc chloride concentration have on plaque development?
• What happens to the length of Citrus limon roots as the Oxytetracycline concentration is raised from 5 mg/L to 10 mg/L?
• Is there a correlation between the pH of spoiled milk and the temperature at which it was stored?
• How can the opposing effects of temperature and light intensity on the time it takes for photosynthesis to occur cancel each other out?
• How can the acidity of certain drinks contribute to tooth decay?
• What happens to your heart rate if you suddenly start working out hard, and how much of an effect does warming up have on your maximum heart rate
• How effective are natural antiseptics such as ginger and turmeric compared to store-bought alternatives?
• How potent are synthetic antibacterial treatments in comparison to natural antibacterial remedies?
• What effect does sodium chloride have on bougainvillea seed germination at various concentrations?
• What effect does soil composition have on the propagation of a plant's offshoots?
• How much does the amount of sodium nitrate powder used to preserve meat reduce its quality?
• For what reason does moringa seed and leaf extract (herbal medication) inhibit the growth of dandruff-causing Malassezia yeast (Pittosporum)?
• Which laundry detergent is best in breaking down lipids and getting rid of stains?
• When it comes to radishes, how does the salinity of the water effect their development rate?
• Does Gibberellic acid influence dolly Parton rose germination, and how does it react at various concentrations?

Assessed internally and moderated externally by the IB, Biology IA at SL and HL accounts for 25% and 20% of the final grades respectively. Your teacher will assess your work out of 24 based on well-defined assessment criteria. As such, you should work on a topic that you can explore comprehensively within the scope of the assignment.

Final Thoughts

The IB Biology IA assignment isn’t as lengthy as the extended essay in the same subject, but it can be quite involving. You’ll conduct extensive experiments and the writing process is going to be somewhat longer.

To have an easy time working on the subject, it’s best to choose a topic that interests you, so you can focus on an area that you’ve always wanted to explore.

Given that we’ve shared over30 topic ideas with you, you shouldn’t have a difficult time figuring out what to work on.

About the author 

Antony W is a professional writer and coach at Help for Assessment. He spends countless hours every day researching and writing great content filled with expert advice on how to write engaging essays, research papers, and assignments.