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Which plant tissue is responsible for moving organic nutrients as a solution through sieve elements, driven by osmotic pressure differences as described by the mass flow hypothesis?

1. Phloem
2. Xylem
3. Both phloem and xylem
4. Neither phloem nor xylem

Correct answer: Phloem

Solution

Phloem is responsible for the transport of organic food in plants, and the mass flow hypothesis explains this process through an osmotically generated pressure gradient in sieve elements.

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