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Paper 2 rewards structured reasoning more than raw knowledge. This guide covers the command-term decoder, the 8-mark response framework, and the timing math for SL and HL.
The command term tells you exactly what the mark scheme rewards. Matching it is the cheapest way to add marks — most students lose marks by describing when they were asked to explain, or by giving a one-sided argument when asked to discuss.
| Command term | What examiners reward | Typical mark tariff |
|---|---|---|
| State | Give a specific factual answer. No explanation needed. | 1 mark |
| Outline | Give a brief summary of key points. Bullet format acceptable. | 2–3 marks |
| Describe | Give a detailed account — include named structures, sequence, or trend. | 2–4 marks |
| Explain | Give reasons or causes. Always include "because" logic. | 3–5 marks |
| Compare and contrast | Give similarities AND differences — ideally side by side, not alternating. | 3–5 marks |
| Distinguish | Give differences only. Paired points. | 2–4 marks |
| Discuss | Give a balanced argument — multiple perspectives, evidence for and against. | 4–8 marks |
| Evaluate | Weigh strengths and weaknesses, give a judgement at the end. | 4–8 marks |
| Justify | Give reasons that support a conclusion or choice. | 3–6 marks |
| Suggest | Propose a plausible explanation — novel contexts where the student has not seen the answer directly. | 2–4 marks |
Eight-mark questions reward discrete mark-worthy points, not eloquent prose. Structure each answer as a planned sequence of IB-biology claims with a mechanism and an example.
Write 3 main biological claims in the margin. Each claim targets 2 marks (1 for claim, 1 for development).
For each claim: state the point (1 mark), explain the mechanism using IB syllabus language (1 mark), name a specific example or data point (dev mark if not already banked).
If "discuss" — close with a balanced comparison. If "evaluate" — close with a judgement. If "suggest" — close with a proposal grounded in biology you have given.
Many 8-markers include a "quality" mark for breadth — covering multiple themes or scales. Make sure your 3 claims do not sit within a single theme.
Paper 2 replaces the old Paper 2 + Paper 3 structure. SL: 1 hour 15 minutes, ~45 marks. HL: 2 hours 15 minutes, ~72 marks. The paper combines three sections: data-based short response, several short-answer questions, and extended-response questions of 6–8 marks. Content is drawn from across Themes A–D and AHL (for HL).
Aim for 1 minute per mark — 8 minutes for an 8-marker including a 1-minute plan. Time on an 8-marker is the single most frequent area where students overwrite without gaining marks. If you plan for 3 main biological points with 2 development marks each, you will score well.
Use the "point → mechanism → evidence" scaffold per mark. Start with the biological claim, explain why it is true using IB-level mechanism, and back it with a specific example (a protein, a pathway, a figure from a past paper). Each bullet hits one mark. Do not write prose paragraphs when the mark scheme expects discrete mark-worthy points.
The five most common command terms in recent Paper 2 exams: Explain, Outline, Describe, Compare and contrast, and Discuss. "Suggest" appears in novel-context questions and carries the highest command-term risk because students revert to describing rather than proposing.
Only if asked explicitly. A clean, labelled diagram that conveys a process (e.g. glycolysis stages, the cardiac cycle) can replace several sentences and earn marks quickly. Badly drawn diagrams with unclear labels lose marks. Rule of thumb: draw only what you can execute cleanly in 2 minutes.
Only if the example still sits within the 2025 syllabus scope. Options have been absorbed into the four themes (human physiology is mostly in Theme C, neurobiology elements in C2). Legacy option-specific examples (e.g. detailed immunology beyond AHL C3.2) are low-yield and can confuse examiners on the 2025 paper.
Cerebrum's Paper 2 bootcamp gives you 3 timed mocks plus criterion-style feedback on every 8-marker — the fastest way to convert a 5 into a 7.
Book Paper 2 Bootcamp