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Biology — free IB HL course

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Higher Level · IB Diploma · Free premium course

Biology

40 premium lessons live for IB Diploma Biology. Learn visually, read concise notes, then practise with criterion marking on every topic.

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13 interactive simulations across 11 topics — browse the Simulation Lab →

ContentsBiology HL · 40 topics

Unit A · 9 topics

Unity and diversity

◆Water2 simsA1.1CONTINUENucleic acidsA1.2Origins of cellsA2.1Cell structureA2.2VirusesA2.3Diversity of organismsA3.1Classification and cladisticsA3.2Evolution and speciationA4.1Conservation of biodiversityInteractive diagramA4.2

Unit B · 10 topics

Form and function

Carbohydrates and lipidsB1.1ProteinsB1.2Membranes and membrane transport1 simB2.1Organelles and compartmentalizationB2.2Cell specialization1 simB2.3Gas exchangeB3.1Transport1 simB3.2Muscle and motilityB3.3Adaptation to environmentB4.1Ecological nichesB4.2

Unit C · 9 topics

Interaction and interdependence

Enzymes and metabolismInteractive diagram1 simC1.1Cell respirationC1.2PhotosynthesisC1.3Chemical signalling1 simC2.1Neural signalling1 simC2.2Integration of body systemsC3.1Defence against infectious diseaseC3.2Populations and communities2 simsC4.1Transfers of energy and matterC4.2

Unit D · 12 topics

Continuity and change

DNA replicationD1.1Protein synthesisD1.2Mutation and gene editingD1.3Cell and nuclear divisionInteractive diagramD2.1Gene expression1 simD2.2Water potentialD2.3ReproductionD3.1Inheritance1 simD3.2HomeostasisD3.3Natural selectionD4.1Stability and changeD4.2Climate change1 simD4.3
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Free IB Biology HL course — 40 topics

Revise IB Diploma Biology (Higher Level) topic by topic. This free course covers 40 official syllabus points with visual lessons, worked examples, and markband-aligned past-paper practice. Each topic links to IB criterion practice on MarkScheme — a free alternative to paid note sites for students searching "IB Biology notes" or "IB Biology revision".

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