Which Science Should I Take in IB? (Biology vs Chemistry vs Physics)
Choosing a science subject in the IB Diploma Programme is a big decision—it shapes your academic experience, influences your university options, and can impact how much you enjoy the next two years. This guide breaks down the key differences between IB Biology, Chemistry, and Physics, supported by expert insights and blog resources from RevisionDojo.
1. Overview: How the Sciences Compare in IB
- Biology focuses on life systems, human anatomy, ecology, and molecular processes.
- Chemistry dives into reactions, lab work, organic compounds, and analytical methods.
- Physics explores motion, energy, forces, and mathematical reasoning.
For a full side-by-side subject comparison, see RevisionDojo’s IB Science Difficulty Guide.
2. Which Science Is the “Easiest” or “Hardest”?
Alumni often say:
- Biology HL requires heavy memorization.
- Chemistry HL is conceptually complex and lab-heavy.
- Physics HL is mathematically demanding.
The difficulty also depends on your learning style. This blog discusses which science subjects students regret or love based on their expectations.
3. What Science Should I Take Based on University Goals?
Here’s a simple breakdown:
Career PathRecommended IB ScienceMedicineChemistry HL + Biology HL/SLEngineeringPhysics HLEnvironmental ScienceBiology HLPharmacyChemistry HLArchitecturePhysics HL/SLPsychologyBiology HL
Learn more in RevisionDojo’s guide on subject selection for university.
4. Biology: Deep Dive
- Great for students who enjoy understanding organisms, systems, and processes.
- Requires strong memorization and consistent reviewing.
- Labs are more observational than calculation-based.
Study Tip: Use mind maps and diagrams. RevisionDojo offers Biology IA support and lab tips to guide you.
5. Chemistry: Deep Dive
- Ideal for students with strong problem-solving skills and curiosity about reactions.
- Requires logical thinking and attention to detail in labs.
- A must for medicine, chemistry, and natural sciences programs.
Study Tip: Practice balancing equations and learn mechanisms early. See How to Score in IB Chemistry.
6. Physics: Deep Dive
- For students confident with math and interested in how the world works at a physical level.
- Concepts build logically but require strong foundational math skills.
- Labs require measurements, graphs, and precise calculations.
Study Tip: Work through past questions regularly. See Surviving IB Physics HL for a realistic view.
7. Do You Need HL Science for Your Degree?
Not always, but some competitive programs (e.g., Medicine, Engineering) will expect HL in Chemistry or Physics.
Consult RevisionDojo’s university requirement breakdown for clarity.
8. Which Science Do Students Enjoy the Most?
Enjoyment is subjective:
- Biology appeals to those who love nature and the human body.
- Chemistry wins over students who like structure and problem-solving.
- Physics is rewarding for those who like logic and puzzles.
This regret and success blog dives into how expectations align with student experience.
FAQs: Choosing IB Science Subjects
Q: Can I switch science subjects after Year 1?
Not usually—too much content is missed. Choose wisely from the start.
Q: Can I take two sciences?
Yes, if you're aiming for competitive STEM programs.
Q: Is HL Biology easier than HL Chemistry?
They’re different: Biology is more memorization-based, Chemistry is more conceptual.
Q: Which science has the most lab work?
Chemistry typically has the most intensive labs; Physics is more technical.
Conclusion: Choose Based on Strengths + Future Plans
There’s no “best” science—only the best science for you. Align your choice with your academic strengths, university goals, and genuine interest.
🎓 Need more help choosing or preparing for your IB Science? Head to RevisionDojo.com for full subject guides, lab report templates, IA tips, and high-scoring revision strategies tailored for IB Biology, Chemistry, and Physics.
