ct one: a. In apoplastic loading, the solute potential of the companion cells is more negative than the apoplastic space nearby. b. Apoplastic phloem unloading enables the import of sugars against their concentration gradient into sink tissue. C. In apoplastic loading, proton pumps create electrochemical gradients that can be used by symporter proteins to import sugars into the companion cell. d. All the statements are true. e. Symplastic loading relies on diffusion of the sugars through plasmodesmata from photosynthetic cells to the phloem cells.

ct one: a. In apoplastic loading, the solute potential of the companion cells is more negative than the apoplastic space nearby. b. Apoplastic phloem unloading enables the import of sugars against their concentration gradient into sink tissue. C. In apoplastic loading, proton pumps create electrochemical gradients that can be used by symporter proteins to import sugars into the companion cell. d. All the statements are true. e. Symplastic loading relies on diffusion of the sugars through plasmodesmata from photosynthetic cells to the phloem cells.

Biology (MindTap Course List)

11th Edition

ISBN:9781337392938

Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg

Chapter34: Leaf Structure And Function

Section: Chapter Questions

Problem 11TYU: There is a trade-off between photosynthesis and transpiration in leaves because (a) numerous...

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When considering the loading and unloading of photosynthate from the phloem, which of the following is FALSE? Select one: a. Apoplastic phloem unloading enables the import of sugars against their concentration gradient into sink tissue. b. In apoplastic loading, the solute potential of the companion cells is more negative than the apoplastic space nearby. c. In apoplastic loading, proton pumps create electrochemical gradients that can be used by symporter proteins to import sugars into the companion cell. d. All the statements are true. e. Symplastic loading relies on diffusion of the sugars through plasmodesmata from photosynthetic cells to the phloem cells.
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