Biology

Which level are you studying?

Selected biology questions are organised across the four current IB themes. HL adds extra depth within the same themes — such as nucleic acid structure, chemiosmosis, gene expression and hormonal homeostasis — on top of the core SL content. Choose your level to see the right set of selected practice questions.

BIOLOGY SL4 topics

Biology SL

Selected practice across the four current IB Biology themes (Unity and diversity, Form and function, Interaction and interdependence, Continuity and change). Selected topics only, not full syllabus coverage.

76 questions76 analysis tasks245 practice marksPractice beta

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BIOLOGY HL4 topics

Biology HL

HL-only depth across the same four current themes: nucleic acids, metabolism and photosynthesis, plant and animal physiology, and population genetics. Selected topics only, not full syllabus coverage.

75 questions75 analysis tasks262 practice marksPractice beta

Start practising

Not sure which level you're in? Check your subject registration or ask your teacher or IB coordinator.

Need more than self-practice? Request an IB Biology tutor.