A-LevelBiologyTransport in plants9700/12 · Oct/Nov 2020 · Q231 Mark

Which combination of features is correct for a phloem sieve tube element as it unloads into a sink? [Figure 23.1]

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Awater potential: higher than sink, lignified cell wall: absent

Bwater potential: higher than sink, lignified cell wall: present

Cwater potential: lower than sink, lignified cell wall: absent

Dwater potential: lower than sink, lignified cell wall: present

✓ Correct answer

A: water potential: higher than sink, lignified cell wall: absent

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Topic: Transport in plants, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2020 Paper 1 Variant 2, question 23.

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