IB Biology IA Topics: 20+ Great Ideas for SL and HL

Brainstorming can unveil some great IB Biology IA topics for your SL or HL internal assessment. However, spending hours on topic research isn’t the best approach if you don’t have enough time left for the assignment.

To help you speed up the process, we’ve put together a list of 20+ Biology IA idea from which you can pick a topic to investigate further.

Be careful when choosing a topic from this list. If anything, ensure the topic you select is something you can apply in real life because personal engagement is an important part of the assessment criteria.  

Key Takeaways

  • The Biology IA assignment requires you to write an individual report, and it’s no more than 3,000 words long.
  • You should choose a topic that you find interesting to explore, as your personal interest can go a long way to speed up the writing and research process.
  • The topic you choose should allow you to do a thorough evaluation and draw reasonable conclusion, as evaluation and conclusion account for 50% of this IA’s grade.

What’s the Overall Grade for IB Biology IA?

IB Biology IA accounts for 25% and 20% of the final grades at Standard and Higher Level respectively.

Your teacher will evaluate your work internally out of 24 based on the Biology assessment criteria, and your school will send the assessment to IB for external moderation.

Because the final grades are higher, you should choose a topic that you can explore with ease and comprehensiveness within the scope of the assignment.

20+ IB Biology Internal Assessment (IA) Topics

You have 100% freedom when it comes to choosing IB topics on any subjects including Biology. That means you can focus on any idea as long as it centers on research and scientific writing in the Biology subject.

The following are some ideas to get you started: 

  1. Investigate the relationship between home furnishings and impaired plant development.
  2. Assess the rapid neutralization of hydrochloric acid and do a comparative analysis of cumin, turmeric, and indigestion tablets.
  3. Explore the impact of zinc chloride concentration on plaque formation.
  4. Your paper can explain the influence of oxytetracycline concentration on the root length of citrus lemon.
  5. Focus on the the interplay between temperature and light intensity on photosynthesis duration.
  6. You can analyze the contribution of drink acidity to dental caries formation.
  7. Demonstrate that you understand the immediate and cumulative effects of intense physical activity on heart rate, with emphasis on warm-up practices.
  8. Do an assessment of natural antiseptics (ginger and turmeric) versus commercial alternatives.
  9. Conduct a comparative evaluation of synthetic and natural antibacterial agents.
  10. Explain the impact of sodium chloride on bougainvillea seed germination at varied concentrations.
  11. Investigate the influence of soil composition on plant offshoot propagation.
  12. Quantify the impact of sodium nitrate powder on meat preservation quality.
  13. Focus on the inhibition of malassezia yeast growth by moringa seed and leaf extract.
  14. Do a comparative analysis of laundry detergents in lipid breakdown and stain removal.
  15. Examine the influence of water salinity on the development rate of radishes.
  16. Explore the impact of temperature on the Vitamin C content across a spectrum of fruit juices.
  17. Dynamics of baroreceptor feedback and pulse rate in response to rapid changes in body posture.
  18. Do a comparative study on the buffering capacities of detergents, beverages, yogurt, and milk.
  19. Conduct an experimental verification of the influence of optimal pH on the growth rates of pinto and green beans.
  20. Talk about the temperature-dependent activation energy in the catalytic decomposition of H2O2 by catalase enzyme with an aluminum inhibitor.
  21. Assess the impact of organic household waste on tomato seed germination and emergence.
  22. Do an in-depth analysis on the correlation between carbonated drink volume, pH, and tooth erosion.
  23. Do an in vitro examination of aluminum chloride’s effects on the degradation of hydrogen peroxide by liver catalase enzyme.
  24. Correlate the changes in seashell mass and carbon monoxide emission with HCL concentration.
  25. Examine the threat of river pollution on the water source for marine life.
  26. Focus on the influence of environmental factors, including light and temperature, on fruit ripening.
  27. Evaluate respiration rates of wine yeast and baker’s yeast in various sugar solutions
  28. DNA mobility in Agarose Gel: Understanding the impact of concentration changes
  29. You can conduct a comparative analysis of HDI and cancer mortality rates in the top and bottom 25 nations.
  30. Explore the relationship between Body Mass Index (BMI), skin surface temperature, and recovery from cold exposure.
  31. Write about the influence of metal ions on the breakdown rate of hydrogen peroxide: a comprehensive study.
  32. Find the discrepancies in chlorine concentrations among locally available brands of treated water: a silver nitrate titration approach.
  33. Write about post-workout effects of energy drinks on cardiovascular function and blood pressure.
  34. Explain the impact of energy drinks on blood pressure and heart rate post-exercise: a comprehensive analysis.
  35. You can examine the efficiency of milk digestion in relation to varying lactase amounts.

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Final Thoughts

While it’s not as lengthy as an extended essay in the same subject, an internal assessment in Biology can be involving and equally challenging. You will have to choose a good topic, conduct experiments, write extensively, and edit keenly.

We can’t stress enough how it’s important to choose a topic that fascinates you. Doing so allows you to focus on an area that you can easily explore and write.

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