CAPE Biology Unit 2 · 2011 · Paper 1 · Question Q18
The function of the companion cell in mature phloem tissue is to
- (A)provide structural support for the sieve tubes
- (B)provide a nucleus needed for cell division of the sieve tube elements
- (C)move sucrose against a concentration gradient into the xylem
- (D)actively move sucrose out of neighbouring photosynthesizing cells to the sieve tubes
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