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The translocation of organic solutes in sieve tube members is supported by

1. P-proteins
2. mass flow involving a carrier and ATP
3. cytoplasmic streaming
4. root pressure and transpiration pull

Correct answer: mass flow involving a carrier and ATP

Solution

Organic solutes in sieve tube members are transported by pressure-driven mass flow in the phloem. ATP-powered carrier proteins help load and unload sugars, establishing the concentration and pressure differences that drive this movement.

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