Biology by Bradford
IB Biology practice questions, by topic.
1,963 original exam-style questions with markschemes, covering every statement in the 2025 guide. Each subtopic page has a ready-made practice paper: teachers can set it as a quiz or homework, students can take it on screen and mark themselves. Print it, project it, or rebuild it in one click. Free, no login.
Full-length mocks
- Paper 1 Standard level55 marks · 1 hour 30 minutes
- Paper 1 Higher level75 marks · 2 hours
- Paper 2 Standard level51 marks · 1 hour 30 minutes
- Paper 2 Higher level80 marks · 2 hours 30 minutes
Theme A · Unity and diversity
- A1.1 Water45 questions · 21-mark SL paper
- A1.2 Nucleic acids56 questions · 20-mark SL paper
- A2.1 Origins of cells45 questions · 20-mark HL paper
- A2.2 Cell structure58 questions · 22-mark SL paper
- A2.3 Viruses45 questions · 22-mark HL paper
- A3.1 Diversity of organisms46 questions · 22-mark SL paper
- A3.2 Classification and cladistics45 questions · 20-mark HL paper
- A4.1 Evolution and speciation46 questions · 22-mark SL paper
- A4.2 Conservation of biodiversity46 questions · 22-mark SL paper
Theme B · Form and function
- B1.1 Carbohydrates and lipids46 questions · 20-mark SL paper
- B1.2 Proteins47 questions · 20-mark SL paper
- B2.1 Membranes and membrane transport46 questions · 21-mark SL paper
- B2.2 Organelles and compartmentalization45 questions · 22-mark SL paper
- B2.3 Cell specialization46 questions · 20-mark SL paper
- B3.1 Gas exchange48 questions · 20-mark SL paper
- B3.2 Transport68 questions · 20-mark SL paper
- B3.3 Muscle and motility45 questions · 20-mark HL paper
- B4.1 Adaptation to environment45 questions · 22-mark SL paper
- B4.2 Ecological niches45 questions · 20-mark SL paper
Theme C · Interaction and interdependence
- C1.1 Enzymes and metabolism50 questions · 20-mark SL paper
- C1.2 Cell respiration58 questions · 20-mark SL paper
- C1.3 Photosynthesis50 questions · 22-mark SL paper
- C2.1 Chemical signalling46 questions · 22-mark HL paper
- C2.2 Neural signalling46 questions · 21-mark SL paper
- C3.1 Integration of body systems52 questions · 22-mark SL paper
- C3.2 Defence against disease45 questions · 20-mark SL paper
- C4.1 Populations and communities46 questions · 20-mark SL paper
- C4.2 Transfers of energy and matter70 questions · 21-mark SL paper
Theme D · Continuity and change
- D1.1 DNA replication45 questions · 20-mark SL paper
- D1.2 Protein synthesis48 questions · 20-mark SL paper
- D1.3 Mutation and gene editing45 questions · 21-mark SL paper
- D2.1 Cell and nuclear division46 questions · 22-mark SL paper
- D2.2 Gene expression45 questions · 20-mark HL paper
- D2.3 Water potential47 questions · 22-mark SL paper
- D3.1 Reproduction53 questions · 21-mark SL paper
- D3.2 Inheritance76 questions · 20-mark SL paper
- D3.3 Homeostasis45 questions · 20-mark SL paper
- D4.1 Natural selection46 questions · 20-mark SL paper
- D4.2 Stability and change45 questions · 20-mark SL paper
- D4.3 Climate change46 questions · 22-mark SL paper
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