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Which plant cells assist sieve tube members by supplying them with proteins and ATP for their transport functions?

1. Sieve tube members
2. Companion cells
3. Both sieve tube members and companion cells
4. None of these

Correct answer: Companion cells

Solution

Companion cells are closely associated with sieve tube members and provide the proteins and ATP needed for phloem transport. They keep the sieve tubes functioning because sieve tube elements have reduced cellular machinery.

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