A-LevelBiologyCell membranes and transport9700/12 · Oct/Nov 2025 · Q191 Mark

In an experiment, four different-sized cubes of colourless agar were placed into a blue dye. The time taken for each cube to turn blue was recorded. Which row shows the surface area and volume of the cube that took the longest time to turn completely blue?

Asurface area /cm²: 6.0, volume /cm³: 1

Bsurface area /cm²: 9.5, volume /cm³: 2

Csurface area /cm²: 12.5, volume /cm³: 3

Dsurface area /cm²: 38.0, volume /cm³: 16

✓ Correct answer

D: surface area /cm²: 38.0, volume /cm³: 16

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Topic: Cell membranes and transport, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2025 Paper 1 Variant 2, question 19.

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