plumiEvidence for evolution: OCR A‑Level Biology A questions
OCR A-Level Biology A past-paper questions on 4.2.2.4 Evidence for evolution, 2016–2025, with mark schemes and examiner’s reports where available.
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Q21(b)
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All 8 questions on Evidence for evolution, as a list
- June 2025, Paper 2, Q21(b) (2 marks): Explain how antibiotic resistance in bacteria provides evidence for the theory of evolution by natural selection. [2]
- June 2025, Paper 2, Q21(c)(i) (5 marks): Complete the sentences using the most appropriate terms. Mutations in DNA are random, so the more time that has passed the more mutations will have occurred. Th
- June 2025, Paper 2, Q21(c)(ii) (3 marks): Explain how fossils can be used to support the theory of evolution by natural selection. [3]
- June 2023, AS Paper 1, Q24(a) (2 marks): Diatoms are single-celled organisms that have glass-like cell walls, which can be preserved as fossils. The graph shows the fossil record for two species of dia
- June 2023, AS Paper 1, Q24(b) (3 marks): A student analyses the estimated ages of 16 species of diatom. The estimated ages show how long ago the species evolved from an ancestor. The student compares e
- November 2021, Paper 2, Q20(b)(iii) (2 marks): Comparing anatomy between species such as beak size in finches can be used to provide evidence to support the theory of evolution by natural selection. Describe
- November 2021, Paper 2, Q20(d) (2 marks): Alfred Russel Wallace is another important figure in the understanding of evolution. Outline the way in which Wallace contributed to the acceptance of Darwin’s
- November 2020, AS Paper 1, Q26(b) (2 marks): Explain how a specific molecule is used to show that two different species have evolved from a recent common ancestor. [2]
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