A-LevelBiologyTransport in plants9700/12 · Oct/Nov 2024 · Q271 Mark

The diagram shows a phloem sieve tube element and a companion cell that are involved in translocation of sucrose. Which process correctly describes the translocation of sucrose through these cells?

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ASucrose moves from Y to Z by active transport.

BProtons move from Y to Z by active transport.

CProtons move from Z to Y by diffusion.

DProtons move from X to W by diffusion.

✓ Correct answer

B: Protons move from Y to Z by active transport.

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Topic: Transport in plants, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2024 Paper 1 Variant 2, question 27.

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