Unity and diversity, form and function, interaction and continuity, from molecules to ecosystems.
4 topics and 40 subtopics, first assessment 2025. HL is everything here; 6 parts marked HL only are left out at SL.
Counts beside each line are what is published for it today.
2 exams, 3 h in total, internal assessment 20% of the grade.
| Component | Time | Marks | Weight |
|---|---|---|---|
Paper 1Calculator 1 h 30 min · 55 marks Sat in one sitting: Paper 1A, 30 multiple-choice questions, and Paper 1B, data-based questions on experimental work (25 marks). | 1 h 30 min | 55 | 36% |
Paper 2Calculator 1 h 30 min · 50 marks Short-answer and extended-response questions. | 1 h 30 min | 50 | 44% |
Scientific investigationInternal Coursework · 24 marks An open-ended investigation and a written report of up to 3,000 words. About 10 hours of work, marked by your teacher and moderated by the IB. | Coursework | 24 | 20% |
2 exams, 4 h 30 min in total, internal assessment 20% of the grade.
| Component | Time | Marks | Weight |
|---|---|---|---|
Paper 1Calculator 2 h · 75 marks Sat in one sitting: Paper 1A, 40 multiple-choice questions, and Paper 1B, data-based questions on experimental work (35 marks). | 2 h | 75 | 36% |
Paper 2Calculator 2 h 30 min · 80 marks Short-answer and extended-response questions. | 2 h 30 min | 80 | 44% |
Scientific investigationInternal Coursework · 24 marks An open-ended investigation and a written report of up to 3,000 words. About 10 hours of work, marked by your teacher and moderated by the IB. | Coursework | 24 | 20% |
A free account keeps your place in the notes and a record of what you practice, topic by topic.