A-LevelBiologyTransport in plants9700/12 · Feb/Mar 2019 · Q241 Mark

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

Awater potential of the phloem sieve tube element: less negative than source, lignification of the cell wall: absent

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

Cwater potential of the phloem sieve tube element: more negative than source, lignification of the cell wall: absent

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

✓ Correct answer

C: water potential of the phloem sieve tube element: more negative than source, lignification of the cell wall: absent

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Topic: Transport in plants, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Feb/Mar 2019 Paper 1 Variant 2, question 24.

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