Biology for IGCSE & O level - Transport In Plants (Section 1 - No. 9)
What is the function of companion cells in the phloem?
They transport water and minerals
They load and unload sugars into sieve tube elements
They support the xylem vessels
They produce oxygen
Explanation
Companion cells are metabolically active cells that help load and unload sugars in and out of the sieve tubes.
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