
Complete Guide to the IB Biology IA: Tips & Ideas
Nail your IB Biology IA with expert tips from a high-scoring tutor. Learn how to plan your lab, avoid complexity, and get 10 Bio IA topic ideas.
This blog post about the Bio IA is written by Asha, a prolific Lanterna tutor. She is currently studying biochemistry at UCL.
I remember thinking that completing and submitting my Internal Assessments and Extended Essay would be the most stressful thing in my life. Oh, how wrong I was. Nonetheless, it’s still an extremely difficult period for most IB students, especially when it seems you have a million different deadlines due all at the same time. One of the most challenging subjects for me to write was my biology IA, partly because I had no idea how to go about it nor any clue of how I could fill up 12 pages of words with my research. So, to help you out, here are some tips on getting started with your Biology IA and a few topic ideas.
Top Tips for Your Biology IA
Tip #1: Write down your lab protocol beforehand
Many students tend to walk into the laboratory expecting to wrap up their experiments within the day or even a couple of hours, only to realise that perhaps the lab doesn’t have all the materials they require. Or worse, they have no idea what the exact method they need to follow is. So the first tip from me would be: plan your bio IA thoroughly beforehand! This includes figuring out what materials you need and writing down your lab protocol so you don’t hit a wall during your experiment.
Tip #2: Adjust your protocol during your bio IA experiment
So this may seem contrary to my first tip, but hear me out on this one. You’ll rarely be able to follow your protocol to the point (unless you’re very lucky, that is). Write down what you’re doing as you go along in case you end up rearranging your steps or subbing one material out for another. You’ll thank yourself later.
Tip #3: Don’t make the bio IA overly complex
I know it’s tempting to create a super-duper complex world problem-solving IA (or at least it was for me). Trust me, though, that’s not the path you want to go down. Your bio IA should be relatively simple or easy to follow. You’ll score more marks writing a detailed report on a simple experiment than writing something about a complex experiment that doesn’t make much sense beyond the surface level.
Tip #4: Don’t be afraid to make mistakes
Your experiment didn’t work exactly how you wanted it to? Don’t stress out about it! Your IA is not meant to be a perfect lab report. It’s almost impossible to obtain perfect results on every trial. If something didn’t do what it was supposed to, how about you try to explain why instead of restarting your whole experiment? If anything, it gives you material to put into your evaluation 🙂
Bonus: 10 Bio IA Ideas
Anyways, that’s it for my tips. Now onto some biology IA topic ideas:
- Measuring the effect of x (any variable – hand sanitiser, toothpaste, temperature, light, alternative medicine, sugar) on bacterial growth
- Measuring the effect of x on seed germination
- Analysing the effect of temperature on food decay
- Measuring the effect of x on yeast growth
- Modelling the spread of a disease/population growth based on different factors
- The effect of limiting factors on photosynthesis
- The effect of age/gender/education on reaction speed
- The difference in CO2 levels in inhaled/exhaled air
- The effect of pollution on bacterial growth
- The effect of surface area: volume ratio on the rate of diffusion

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The most crucial first step is thorough planning. Before even entering the lab, you should define your research question, identify necessary materials, and write a detailed lab protocol. This prevents delays and ensures you have a clear roadmap for your experiment, helping you avoid common pitfalls.
Not necessarily. The guide advises against making your IA overly complex. A simple, well-executed experiment with detailed analysis and evaluation will likely score higher marks than a complex one that lacks depth or clarity. Focus on demonstrating your understanding of scientific methodology and critical thinking.
Don't stress! It's common for experiments not to yield perfect results. Instead of restarting, use this as an opportunity for evaluation. Explain why the experiment might not have worked, discuss limitations, and suggest improvements. This critical reflection can earn you valuable marks and demonstrates a deeper scientific understanding.
The guide suggests various ideas, such as measuring the effect of a variable (e.g., hand sanitiser, temperature, light) on bacterial growth or seed germination, analysing temperature's effect on food decay, or investigating limiting factors on photosynthesis. The key is to choose something manageable, interesting to you, and allows for robust data collection and analysis.
Lanterna tutors, many of whom scored 40+ in the IB and have examiner experience, can provide expert guidance on every stage of your Biology IA. They can help refine your research question, structure your methodology, guide your data analysis, and ensure your evaluation meets IB criteria, all while upholding academic honesty and fostering your independent learning.
Yes, absolutely. Our tutors can discuss your interests and the feasibility of different research questions, helping you narrow down a topic that is both engaging and achievable within the IA guidelines. They ensure your chosen topic allows for strong personal engagement and robust scientific inquiry, setting you up for success.
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