A-LevelBiologyTransport in plants9700/12 · May/June 2023 · Q311 Mark

Which statement supports the theory of active loading of sucrose into companion cells?

AThe pH decreases in the cell wall of the companion cells compared with the cytoplasm.

BThe pH decreases in the cytoplasm of the companion cells compared with the cell wall.

CThe pH decreases in the companion cells and sieve tube elements.

DThe pH decreases in the sieve tube elements compared with the companion cells.

✓ Correct answer

A: The pH decreases in the cell wall of the companion cells compared with the cytoplasm.

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Topic: Transport in plants, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, May/June 2023 Paper 1 Variant 2, question 31.

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