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Mass flow hypothesis A level biology

How is sucrose actively transported from phloem to sink if concentration is lower at the sink end?
Original post by Aeshakhan
How is sucrose actively transported from phloem to sink if concentration is lower at the sink end?

It’s more concerned with moving down the pressure gradient
Reply 2
Original post by Illumilottie
It’s more concerned with moving down the pressure gradient


I understand all that but it says in the book that the unloading is active so I don’t understand why
Original post by Aeshakhan
I understand all that but it says in the book that the unloading is active so I don’t understand why


Unloading can be passive or active as sucrose can be removed from the phloem to surrounding cells either by diffusion or active transport depending on the concentration gradient

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