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May 2024 Paper 1 · TZ1
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Question papers and mark schemes
229 sittings from 1983–2024. The page above is the real paper. Open any sitting to read the rest beside the mark scheme.
229 sittings
2024
2023
November
2022
2021
2020
2019
November
2018
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2017
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2016
November
2015
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2014
November
2013
November
2012
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2011
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1983
November
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Paste a response you have already written for Biology SL — an essay, a commentary, a reflection — and it is marked band by band against the official IB assessment criteria.
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Practice by topic
Criterion-based practice for every syllabus point — revise the lesson, then mark your response band-by-band.
- A1.1Water
- A1.2Nucleic acids
- A2.1Origins of cells
- A2.2Cell structure
- A3.1Diversity of organisms
- A3.2Classification and cladistics
- A4.1Evolution and speciation
- A4.2Conservation of biodiversity
- B1.1Carbohydrates and lipids
- B1.2Proteins
- B2.1Membranes and membrane transport
- B2.2Organelles and compartmentalization
- B2.3Cell specialization
- B3.1Gas exchange
- B3.2Transport
- B4.1Adaptation to environment
- B4.2Ecological niches
- C1.1Enzymes and metabolism
- C1.2Cell respiration
- C1.3Photosynthesis
- C2.1Chemical signalling
- C2.2Neural signalling
- C3.2Defence against infectious disease
- C4.1Populations and communities
- C4.2Transfers of energy and matter
- D1.1DNA replication
- D1.2Protein synthesis
- D1.3Mutation and gene editing
- D2.1Cell and nuclear division
- D2.2Gene expression
- D3.1Reproduction
- D3.2Inheritance
- D3.3Homeostasis
- D4.1Natural selection
- D4.2Stability and change
- D4.3Climate change
IB Biology SL past papers — by session
Every recent Biology exam series we cover (2021–2026), each with Paper 1, Paper 2, Paper 3. Practise a paper, then mark it against the IB band descriptors — that's where the grade is won.
Frequently asked questions
- Where can I find IB Biology SL past papers?
- Open any Biology SL sitting below (1983–2024). Each one has the question paper and, where we hold it, the mark scheme beside it.
- Does IB Biology have mark schemes?
- Yes — IB publishes mark schemes that use markbands and assessment criteria. Our guides explain how examiners place answers into level bands so you can mark your own work like an examiner.
- What's the best way to use Biology past papers?
- Work a full paper under timed conditions, mark yourself strictly against the band descriptors, list every mark you dropped, then drill those skills before the next session.
Best free IB Biology resources
Hand-picked, fully legal and free — official IB papers plus the best teacher-made notes and solutions.