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Free IB DP Biology SL 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 Standard 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. SL covers the core standard-level content alongside a 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 | 55 marks | 1h 30 | 1A multiple choice + 1B data-based, one sitting · 36% |
| Paper 2 | 50 marks | 1h 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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All 11 topics in the IB DP Biology SL syllabus — click any topic to open notes, videos and an AI-marked quiz.
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