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Free IB DP Biology HL revision notes, worked examples, AI-marked practice questions and past papers — mapped to the new IB Biology guide for first exams 2025 onward.
IB Diploma Programme Biology Higher Level is a two-year group-4 science in the International Baccalaureate Diploma. Built on the unifying themes of unity and diversity, form and function, interaction and interdependence, and continuity and change, it studies these at four levels of biological organisation: molecules, cells, organisms, and ecosystems. HL covers all standard-level material plus additional higher-level depth, alongside a substantial practical programme. Assessment is two external examination papers plus an internally assessed scientific investigation, graded on the IB 1-7 scale.
| Paper | Total marks | Duration | Style of questions |
|---|---|---|---|
| Paper 1 | 75 marks | 2h | 1A multiple choice + 1B data-based, one sitting · 36% |
| Paper 2 | 80 marks | 2h 30 | Short-answer + extended-response · 44% |
| Internal Assessment | 24 marks | — | Scientific Investigation (internal) · 20% |
External 80% (Paper 1 36% + Paper 2 44%) · Internal scientific investigation 20% · graded 1-7.
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Test your knowledge with the Pre IB quiz.
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Test your knowledge with the IB HL Year 2 quiz.
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Thousands of MCQ and structured questions with step-by-step worked solutions.
All 15 topics in the IB DP Biology HL syllabus — click any topic to open notes, videos and an AI-marked quiz.
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