Which of the following statements about the movement of sucrose in phloem is FAL

Question

Which of the following statements about the movement of sucrose in phloem is FALSE? A. The loading of sucrose molecules into phloem involves a type of active transport and a membrane transport protein that moves both sucrose and protons (H) B. The loading of sucrose into a phloem cell reduces the water potential in the particular phloem cell. In response, water enters the phloem cell and positive pressure is established in phloem near the source C. Movement through phloem sieve elements is considered symplastic transport. D. The active unloading of sucrose at the sink creates the sucrose concentration gradient necessary for the diffusion of sucrose through phloem. E. Osmosis in and out of the phloem helps create the pressure gradient necessary for the movement of sucrose in phloem.

Explanation / Answer

Answer: Choice E

Explanation: Many biological factors play role in generating the pressure gradient across the phloem tissue for movement of the sucrose. The non-biological agents in this function are either simple diffusion or active transport by utilization of ATP. Osmosis does not play role in generation of pressure gradient for movement of sucrose but indeed helps in maintaining the cellular pressure necessary for holding the sugars while under translocation.

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