A-LevelBiologyTransport in plants9700/12 · Oct/Nov 2021 · Q241 Mark

Which features of companion cells are essential to their function? 1 They are connected to the sieve tube elements by plasmodesmata. 2 They have a thicker cell wall than a sieve tube element. 3 They contain a nucleus and mitochondria.

A1 and 2

B1 and 3

C1 only

D2 and 3

✓ Correct answer

B: 1 and 3

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Topic: Transport in plants, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2021 Paper 1 Variant 2, question 24.

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