Which of the Following Supports the Finding That Sugar Translocation

question 2

Multiple Choice

Which of the following supports the finding that sugar translocation in phloem is an active energy- requiring) process?

• A) Sucrose occurs in higher concentrations in companion cells than in the mesophyll cells where it is produced.
• B) Sugar is translocated in a bi- directional manner.
• C) Strong pH differences exist between the cytoplasm of the companion cell and the mesophyll cell.
• D) Movement of water occurs from xylem to phloem and back again.
• E) H⁺- ATPases are abundant in the plasma membranes of the mesophyll cells.

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