IB Biology Concepts

IB Biology connects molecular systems, cellular structures, organism functions, ecological interactions, inheritance and evolution into one evidence-based study of life.

Syllabus
First assessment 2025
Course
Biology
Level
HL

IB Biology HL Concepts

IB Biology connects molecular systems, cellular structures, organism functions, ecological interactions, inheritance and evolution into one evidence-based study of life.

Syllabus
First assessment 2025
Course
Level
HL

Exam analysis

Published Concept evidence across IB Biology clusters around structure-function relationships, molecular information, regulated interactions and evolutionary change. The course pattern is strongest when students connect mechanisms across levels of organisation rather than learning each topic as isolated facts.

Most tested syllabus areas

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Recent 5 years · Updated 22 Jul 2026

What you’ll learn

4 syllabus sections

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A Unity and DiversityPublished Concept evidence in Unity and Diversity repeatedly links cell structures, nucleic acids, organism diversity and evolution. The strongest pattern is not isolated recall, but explaining how molecular and cellular evidence supports biological unity, variation and classification.90% of analysed papers 338 papers · 799 questionsView sectionB Form and FunctionPublished Concept evidence in Form and Function repeatedly asks students to connect structure with function across molecules, membranes, cells and exchange systems. The strongest pattern is explaining how specific features enable transport, support, movement, regulation or adaptation.65% of analysed papers 245 papers · 1023 questionsView sectionC Interaction and InterdependencePublished Concept evidence in Interaction and Interdependence clusters around regulated processes, signalling, defence and ecological relationships. The recurring pattern is explaining how interactions control biological outcomes, from enzyme activity and energy transfer to population change and ecosystem cycling.67% of analysed papers 250 papers · 1557 questionsView sectionD Continuity and ChangePublished Concept evidence in Continuity and Change repeatedly connects genetic mechanisms, cell division, inheritance, regulation and selection. The strongest pattern is explaining how information is maintained, altered and acted on across cells, organisms and populations.66% of analysed papers 247 papers · 1361 questionsView section

More course resources

Frequently Asked Questions

It covers the full IB Biology syllabus through Concept pages for Unity and Diversity, Form and Function, Interaction and Interdependence, and Continuity and Change.

Concept pages explain the biology first, then use published exam evidence to show which ideas and patterns appear most often.

Yes. Shared syllabus areas are useful for SL and HL, while HL-only topics are marked in the knowledge tree and Concept pages.

It helps connect learning priorities to real assessment patterns without replacing the underlying biology or turning the page into a question list.