A-LevelBiologyCell membranes and transport9700/12 · Oct/Nov 2009 · Q271 Mark

The diagram shows the changes in pressure potential (Ψp), solute potential (Ψs) and water potential (Ψ) when a plasmolysed plant cell is placed in pure water. [Graph showing changes in Ψ, Ψp, Ψs over time] Which shows the correct curves for each potential?

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AX: Ψ, Y: Ψp, Z: Ψs

BX: Ψp, Y: Ψs, Z: Ψ

CX: Ψs, Y: Ψ, Z: Ψp

DX: Ψp, Y: Ψ, Z: Ψs

✓ Correct answer

D: X: Ψp, Y: Ψ, Z: Ψs

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Topic: Cell membranes and transport, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2009 Paper 1 Variant 2, question 27.

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