A-LevelBiologyTransport in plants9700/12 · Oct/Nov 2025 · Q311 Mark

Which combination of features is characteristic of a phloem sieve tube element immediately after it is loaded from a source?

Awater potential of the phloem sieve tube element: higher than source, lignification of the cell wall: not present

Bwater potential of the phloem sieve tube element: higher than source, lignification of the cell wall: present

Cwater potential of the phloem sieve tube element: lower than source, lignification of the cell wall: not present

Dwater potential of the phloem sieve tube element: lower than source, lignification of the cell wall: present

✓ Correct answer

C: water potential of the phloem sieve tube element: lower than source, lignification of the cell wall: not present

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Topic: Transport in plants, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2025 Paper 1 Variant 2, question 31.

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