IB Biology HL
Higher Level IB Biology covers cells, molecular biology, genetics, ecology, evolution, and human physiology in depth, taught through the unifying themes of unity, diversity, form, function, interaction, and continuity.
Difficulty
Very Hard
Popularity
74%
Past questions
3
Study tips
5
Key Topics
Exam Format & Dates
May & November, annually
Papers 1–3 ≈ 4h 30m + Internal Assessment
1–7 scale (IB)
4 = passing | 6–7 = excellent
| Section | Duration | Content | Weight |
|---|---|---|---|
| Paper 1 — Multiple Choice + Data | 2 hours | ~40 MCQ + data analysis | 36% |
| Paper 2 — Extended Response | 2 hours 30 minutes | Short + extended answers | 44% |
| Internal Assessment | Coursework (10 hours) | 1 independent investigation | 20% |
Exam Breakdown & Insights
Difficulty · Elite
Popularity score
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Study Tips
- 1
Review required practicals and data-analysis skills — experimental questions appear on nearly every paper.
- 2
Make concept maps connecting topics — modern exam questions frequently cross unit boundaries.
- 3
Draw and label diagrams for every major process — reproducing them from memory is a powerful test of understanding.
- 4
Past papers with mark schemes are the single best IB revision resource — learn exactly how marks are allocated.
- 5
Do not neglect your Internal Assessment: it is a significant chunk of your grade that you control before exam day.
Past Exam Questions
Define Cells and state the key facts a student must know, using precise scientific terminology.
Explain the mechanism behind Molecular Biology: describe what happens and, crucially, why it happens. Include a labelled diagram where appropriate.
Design an experiment (or interpret given data) to investigate Genetics & Inheritance. Identify the variables, describe the method, and explain how you would analyse the results.
Common Mistakes to Avoid
- ✕
Using vague everyday language where precise scientific terminology is required.
- ✕
Ignoring units and significant figures in calculations.
- ✕
Cramming content while neglecting experimental-design and data-analysis questions.
Official Resources
Free, official study material for IB Biology HL — always start with the source your exam board publishes.
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