A-LevelBiologyTransport in plants9700/12 · Oct/Nov 2010 · Q241 Mark

What is the main function of a companion cell in mature phloem tissue?

Aproviding cytoplasmic contact with the sieve tube element for loading

Bproviding structural support for the sieve tube element

Cproviding the nucleus for cell division in the phloem

Dproviding the source of assimilates for storage

✓ Correct answer

A: providing cytoplasmic contact with the sieve tube element for loading

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Topic: Transport in plants, A-Level Biology (syllabus 9700). Multiple choice, 1 mark.
Source: A-Level Biology, Oct/Nov 2010 Paper 1 Variant 2, question 24.

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