Current syllabus · First assessment 2025
IB · Biology
IB Biology Study Guide & Review
Study IB Biology across four themes and four levels of organization, from molecules and cells to organisms and ecosystems, with SL/HL exam practice.
Choose a level to open study resources
Question Bank, Mastery, Concept and Documents links become available after SL or HL is selected.
Syllabus shape
How the Biology syllabus is organised
See the top-level syllabus shape across SL and HL. Choose a course level above before opening its exact topics and learning resources.
- 4
- syllabus groups
- 40
- mapped topics
Shared across levels
4 groups- A Unity and Diversity
- B Form and Function
- C Interaction and Interdependence
- D Continuity and Change
SourceInternational Baccalaureate Organization · IB Biology subject brief, first assessment 2025IB Biology · First assessment 2025·Exam pagePast papers
IB Biology questions
IB Biology is organised around four themes—unity and diversity, form and function, interaction and interdependence, and continuity and change—across molecules, cells, organisms and ecosystems.
SL and HL share the same connected themes and biological concepts, while HL requires greater breadth, depth and exam-ready application of the syllabus.
Yes. The course develops practical work, data analysis, scientific investigation, evaluation of evidence and communication using precise biological terminology.
This page follows the IB Biology course with first assessment in 2025.