plumiOCR A‑Level Biology A questions by topic
Every question from every OCR A-Level Biology A paper, 2016–2025, part by part. Filter by topic, paper or year, open the mark scheme under any question, and download a set as a PDF.
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Calculations
![June 2025 Paper 1, question 7: In experiment one, what is the number of cells in the culture after 10 hours? 0.9 × 107 A 4.0 × 107 B C 7.6 7.6 × 107 D Your answer [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h42001-jun25-07-qp.webp?v=3)
![June 2025 Paper 1, question 8: Which line, A to D, in experiment two represents a culture where the growth rate is approximately double that in experiment one? Your answer [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h42001-jun25-08-qp.webp?v=3)
Q16(a)(i)
The whole paper ↗![June 2025 Paper 1, question 16(a)(i): Identify the components labelled A and B and describe how they are adapted for their function. Component A Adaptation Component B Adaptation [4]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h42001-jun25-16-ai-qp.webp?v=3)
Q16(a)(ii)
The whole paper ↗![June 2025 Paper 1, question 16(a)(ii): Identify one similarity and one difference between the structures of chloroplasts and the structures of mitochondria. Similarity Difference [2]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h42001-jun25-16-aii-qp.webp?v=3)
Q16(b)(i)
The whole paper ↗![June 2025 Paper 1, question 16(b)(i): Calculate the R f for the most soluble pigment. Give your answer to 2 significant figures. Distance travelled = mm Rf = [3]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h42001-jun25-16-bi-qp.webp?v=3)
Q16(b)(ii)
The whole paper ↗
Q16(b)(iii)
The whole paper ↗![June 2025 Paper 1, question 16(b)(iii): Describe how the student could use the same equipment but increase the accuracy of the calculated Rf value. [1]](https://pub-e8a9dbab8e2a4d089f52b2a45e0d0b50.r2.dev/bank/h42001-jun25-16-biii-qp.webp?v=3)
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