IB Biology Downloads: Practice Questions by Topic

🎓 2025 IB Biology syllabus

IB Biology Downloads

These IB Biology downloads give you a practice question paper for each syllabus topic, from A1.1 Water to D4.3 Climate change, grouped into the four themes. Every paper mixes Paper 1A multiple choice, Paper 1B data-based, short answer and extended response questions, with the markscheme at the end. Open a theme below and start with the IB Biology downloads marked ready.

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40topics15ready27question papers

IB Biology downloads: topic-wise practice question papers

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Theme A: Unity and Diversity

9 chapters · 3 ready

A1.1WaterSL + HL

Coming soon

A1.2Nucleic acidsSL + HL

Download

A2.1Origins of cellsHL only

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A2.2Cell structureSL + HL

4 papers

Introduction to cells

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Introduction to cells: question set 2

Download

Cell structure

Download

Microscopy

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A2.3VirusesHL only

Coming soon

A3.1Diversity of organismsSL + HL

Coming soon

A3.2Classification and cladisticsHL only

Coming soon

A4.1Evolution and speciationSL + HL

Coming soon

A4.2Conservation of biodiversitySL + HL

Coming soon

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Theme B: Form and Function

10 chapters · 4 ready

B1.1Carbohydrates and lipidsSL + HL

Coming soon

B1.2ProteinsSL + HL

Coming soon

B2.1Membranes and membrane transportSL + HL

3 papers

Cell membranes

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Membrane transport

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Membrane transport: chapter PDF

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B2.2Organelles and compartmentalizationSL + HL

Coming soon

B2.3Cell specializationSL + HL

Download

B3.1Gas exchangeSL + HL

Download

B3.2TransportSL + HL

Download

B3.3Muscle and motilityHL only

Coming soon

B4.1Adaptation to environmentSL + HL

Coming soon

B4.2Ecological nichesSL + HL

Coming soon

ExtraDigestion and absorptionBonus

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🌿

Theme C: Interaction and Interdependence

9 chapters · 6 ready

C1.1Enzymes and metabolismSL + HL

Download

C1.2Cell respirationSL + HL

5 papers

Cell respiration and ATP

Glycolysis

Fate of pyruvate

Krebs cycle

Electron transport chain

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C1.3PhotosynthesisSL + HL

Download

C2.1Chemical signallingHL only

Coming soon

C2.2Neural signallingSL + HL

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C3.1Integration of body systemsSL + HL

3 papers

Integration of body systems

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Hormones and the endocrine system

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Plant tropisms and hormones (HL)

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C3.2Defence against diseaseSL + HL

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C4.1Populations and communitiesSL + HL

Coming soon

C4.2Transfers of energy and matterSL + HL

Coming soon

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Theme D: Continuity and Change

12 chapters · 2 ready

D1.1DNA replicationSL + HL

Coming soon

D1.2Protein synthesisSL + HL

Coming soon

D1.3Mutation and gene editingSL + HL

Coming soon

D2.1Cell and nuclear divisionSL + HL

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D2.2Gene expressionHL only

Coming soon

D2.3Water potentialSL + HL

Coming soon

D3.1ReproductionSL + HL

Coming soon

D3.2InheritanceSL + HL

Coming soon

D3.3HomeostasisSL + HL

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D4.1Natural selectionSL + HL

Coming soon

D4.2Stability and changeSL + HL

Coming soon

D4.3Climate changeSL + HL

Coming soon

How to use these IB Biology downloads

Start with the theme your class is studying now. Open the matching topic, read the notes for it, and then attempt the paper in one sitting with a timer, just as you would in the exam. Leave the markscheme alone until you finish. When you mark your work, note every command term you missed, such as outline, explain or evaluate, and rewrite those answers. HL students should also complete the HL only topics. To check exactly what each topic covers, compare your progress with the official IB Diploma Programme Biology subject page.

IB Biology downloads: quick answers

Are these papers free? Yes. Create a free account, log in and every Download button works.

Do they cover SL and HL? Yes. Each topic is tagged SL + HL or HL only, so HL students can find the extra content and SL students can skip it.

Where are the notes? Every topic has revision notes with diagrams on the IB Biology notes page. Read the notes first, then attempt the paper under timed conditions and mark it with the markscheme.