When considering the loading and unloading of photosynthate from the phloem, which of the following is FALSE?

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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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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