New syllabus, first assessed May 2025 — four themes across four levels of organisation (molecules, cells, organisms, ecosystems). Same IA at SL and HL.
IB Biology is assessed by two external papers and one internal assessment. Paper 1 (multiple-choice + data-based) is worth 36%, Paper 2 (data, short-answer and essays) is worth 44%, and the scientific investigation IA is worth 20%. External exams make up 80% of the final grade.
Both levels share the same weightings (Paper 1 36%, Paper 2 44%, IA 20%). HL covers additional higher level content, sits longer papers (Paper 1 2 hours, Paper 2 2h30) and runs to 240 teaching hours versus 150 at SL.
The syllabus is organised around four themes — Unity and diversity, Form and function, Interaction and interdependence, and Continuity and change — studied across four levels of organisation: molecules, cells, organisms and ecosystems.
Yes. IB Biology was restructured for first assessment in May 2025. The previous 11-topic syllabus was replaced by the four-theme, four-level conceptual structure.
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