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why is loading of sucrose into phloem done by active transport?

davashkai

wrote...

Posts: 100

Rep:

12 years ago

why is loading of sucrose into phloem done by active transport?

I don't understand why sucrose moves AGAINST its concentration gradient from the SOURCE into the PHLOEM.

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1 Reply

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juliem

wrote...

#1

12 years ago

Sucrose is a very valuable substance. In order to get as much as possible into the phloem, it is actively transported. If diffusion were the only way to move sucrose, only half the sucrose produced would get into the phloem before reaching equilibrium.

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