A-LevelBiologyTransport in plants9700/12 · May/June 2021 · Q261 Mark

In plants, assimilates such as sucrose are loaded from source cells into sieve tube elements. The assimilates are then transported from source to sink. What is needed to transport sucrose from source cells through phloem tissue to sink cells? [Figure 26.1]

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Awater potential gradient between the source and the sink AND ATP

BATP only

Chydrostatic pressure gradient between the source and the sink AND ATP

Dhydrostatic pressure gradient between the source and the sink only

✓ Correct answer

C: hydrostatic pressure gradient between the source and the sink AND ATP

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Topic: Transport in plants, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, May/June 2021 Paper 1 Variant 2, question 26.

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