What is a good IB Biology IA topic
Erwin March 17, 2023

The most important step in creating an IB Biology Investigation is selecting the ideal IA topic. IB Biology IA Ideas won’t just come to you, but here is a collection of 30+ IB Biology IA ideas to get your brain working! Never before has picked an IB Biology IA topic been so simple!


Let’s first gain a thorough understanding of the IB Biology Diploma Program Subject, its goals, how it is broken down into parts, and what the IB expects of you before we start looking for IB Biology IA ideas.


Since they account for 20% of the overall score, IB IAs are a crucial component of one’s overall subject performance. The best way to encourage pupils to use their knowledge by observing, querying, and investigating is through internal assessments. The criteria used to evaluate the investigation are personal engagement, exploration, analysis, evaluation, and communication.


Choosing an interest-piqued topic is the best method to ace the IB Biology IA Exam, or any IA for that matter. An IA that has been carefully thought out, organized, and carried through demonstrates entire zeal and excitement. It’s the same as picking just one Biology IA topic from a platter of ideas.


It Is important to keep in mind that your IA would either demand you to: When choosing from a variety of IB Biology IA concepts for your inquiry, you would need to:

Perform a laboratory experiment to gather data, analyze information from a reliable database, or perform a thorough study utilizing simulation or modeling.


In either case, you must show personal engagement with your subject and a connection to it, as this will serve as the framework for the remainder of your research. The least you can do is conduct adequate research; everything else will follow. An overview of how to select an appropriate IB Biology IA topic for your report is provided below:



· Recognize your Interests:

Look through a variety of IA themes to determine which subjects align with the IB Biology curriculum, and if something catches your eye, hang onto it!


· Keep it focused:

The concept shouldn’t be either too general or too simple. An idea for an IA that exudes creativity and provides space for appropriate study and analysis is perfect.


Be realistic; describe the tools, resources, and time needed to assess the viability.

Tada! You’re all set!


Follow the Process

Now that you know how to choose the one ideal subject, let’s quickly recap the correct preparation and process involved in creating an IB Biology IA:


Short Research Question:

The Aim of the Investigation and Your Research Question are two distinct sub-headings with different meanings. The research question should be concise and pertinent. While the Research Question addresses the what, the Aim addresses the Why.


Establish the Background:

It’s critical to establish the Research Question’s context within the context of the selected issue. IB wants you to briefly describe what motivated you to choose a certain topic in Background, and ideally to provide a personal experience that supports your choice and engagement. For instance, if you decide to look into how peppered moth predation is influenced by light levels, you may begin by explaining how this species has captured your interest ever since it was introduced to you in one of your normal classes before providing a more scientific justification.

Make sure to draw attention to your independent and dependent variables as well as your hypothesis. Clearly state your hypothesis; it is significant to your research. It is also necessary to note any restrictions. To ensure a fair experiment, all other conditions must be maintained constant. The Independent variable is the only one you are permitted to change. The Dependent variable is the one you measure as it changes in conjunction with the independent variable.


Method and Tools Employed:

The process should be well planned out.


Analyses and Conclusions: Conduct the pertinent analyses while keeping the research question in mind, then conclude.

Evaluation: It is important to list limitations and improvements.

Recognizing the safety guidelines provided by IB and taking the ethical implications of your research into account is essential.


Think About this Query:

“How do you intend to reduce the environmental impact of your experiment if there are any ethical issues with your report?”

Another crucial component of your IA that requires attention is referencing sources and citing documents/webpages.

It’s crucial to keep in mind that although you are permitted to draw inspiration from previously published research, papers, or journals, you are nonetheless expected to produce the idea in your inquiry from a fresh angle.

Think of additional factors controlling or affecting seed germination; with a focus on quantitative data, you could advance in your report. For instance, an idea inspired by how soil pH affects seed germination could be investigated in a new light.

Now that you have all the information you need, it’s time to share with you some incredible IB Biology IA suggestions to inspire you to put your thinking caps on and approach the task with a fresh passion.

These concepts are intended to help you get started down this road; your final IB Biology Investigation concept is your interpretation of one of them.


Important Topics for IB Biology IA

Without further ado, let’s go right into IB Biology IA investigation topic ideas!

1. Evaluating the impact of different types of light on the rate of photosynthesis in a tomato plant (Solanum Lycopersicum).
Molecular Biology Lab, Simulation-based (Metabolism, Cell Respiration, Photosynthesis)

2. Determining how a light source’s distance from a subject influences the photosynthetic activity
Molecular Biology (Experimental) (Metabolism, Cell Respiration, Photosynthesis)

3. Examining cellular membranes with a spectrovis to monitor color changes brought on by the release of betacyanin as a result of harm to beet cell membranes.
Course reference: Cell Biology (Membrane Structure)

4. Investigating the impact of temperature variations on transpiration rates.
Referral to Course: Experimental Plant Biology

5. Determining how the choice of fruit ripening techniques affects the conversion of starch to glucose.
Course reference: molecular biology (Metabolism, Cell Respiration, Photosynthesis)

6. Investigating the interactions between the lactase enzyme and the lactose present in the Lactaid pills ( Lactose Intolerance pills).
Molecular Biology (Experimental Enzymes) Reference

7. Studying the process of mitosis in garlic and onions (Allium sativum). Likewise, the Mitotic Index calculation for the same.
Referral to Course: Experimental Cell Biology

8. Comparing the absorption spectra of several olive oil grades.
Referral to Course: Experimental Plant Biology

9. Investigating the impact of different temperatures on the pH’s chemical characteristics as well as the phosphorus, potassium, and nitrogen contents of a specific type of soil.
Simulation/Modeling of Plant Biology as a Reference for the Course

10. Investigating how time affects the plasmolysis of potatoes.
Database-based reference for the course: Cell Biology (Osmosis)

11. Utilizing a spectrophotometer to examine how the sodium chloride ion concentration impacts how quickly the enzyme amylase breaks down starch.
Molecular Biology (Experimental Enzymes) Reference

12. Determining how light levels affect a specific insect’s predation.
Reference to  the course: ecology

13. Investigating how antibiotics affect the development of bacteria and other microbes.
Using a microbiology database as a source of information

14. Investigating the effects of temperature, algal concentration, other aquatic plants, turbidity, salinity, nutrients, and other variables on the primary productivity of algae samples.
Course Reference: Ecology Experimental

15. Determining whether there is a connection between pH buffers and the primary structure of amylases.
Referral to Course: Experimental Molecular Biology (Enzymes)

Understanding how a specific abiotic element influences a habitat’s biodiversity.
Ecology is a course reference. Based on experiment and simulation

Evaluating the different substances’ ability to act as buffers, such as antacids, milk, sodium bicarbonate, sodium carbonate, detergents, etc.
Buffers are a course reference. Experimental

Investigating the relationship between the prevalence of tuberculosis and a nation’s HDI score.
Course reference: Human Physiology. Experimental

Investigating how aging affects human reaction times.
Course reference: Human Physiology. Experimental

Comparing the respiration rates of lager, wine, and baker’s yeast in different sugar solutions.
Course reference: Cell Biology. Experimental

Investigating the effects of different levels of sunshine exposure on the concentration of Rubiscolin in a plant species’ leaves.
Course reference: molecular biology (Enzymes). Experimental

Investigating the impact of the water from sewage treatment plants and chemical industries on the Water Quality Index (WQI).
Ecology is a course reference. Analysis of Simulations

Investigating the effects of rapid exercise on the heart rate and baroreceptor feedback.
Course reference: Human Physiology. Experimental

By comparing Gersmehl diagrams from various biome or using them in various real-world situations, one can determine the number of nutrients present in biomass, litter, or soil, which are all nutrient sinks.
Ecology is a course reference. The experimental database

Investigating the role of enzymes in the creation of cheese.
Course reference: molecular biology (Enzymes). Experimental

Investigating how the usage of fertilizers with nitrogen or fluoride affects the height of plants
Reference for the subject: Physiology of Plants. Experimental

Investigating the muscles used while one is on their toes (Ballet dancers).
Course reference: Human Physiology. Experimental


Additional Ideas:

Here are a few more concepts you could look at and eventually get inspiration from:

· Different Fertilizers’ Effects on Eutrophication

· Examining milk spoilage in various temperature and sunlight situations, etc.

· Investigating how a certain factor influences the germination of seeds

· Examining the rate of seaweed oxygen synthesis while varying the light’s intensity.

· Investigating more effective cleaning methods for household items will help avoid the growth of microorganisms (for example – mats).

· Investigating how temperature affects photosynthesis in Green Gram (Vigna Radiata).

· Recognizing the impact of various ethanol concentrations on cell membranes.

· Investigating the biology of schizophrenia

· Examining the rate at which certain genetically modified foods degrade.

· Understanding how various factors affect vegetable rot and investigating various preventative measures.



We hope that these few suggestions will inspire you to think creatively and delve more into the wide but fascinating field of biology. IB Biology IA Topics support you in meeting the expectations of the IB Biology curriculum, which is to appreciate scientific challenges in a global context with stimulating opportunities. Although it may seem like a lot of work, with the correct subject at hand, you will surpass your goals! We’d like to take this opportunity to wish you well in your IB Biology IA journey.


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