The translocation of organic solutes in sieve | vedclass

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Question

(B) The translocation of organic solutes (mainly sucrose) in the phloem sieve tubes occurs via the pressure-flow hypothesis or mass flow hypothesis.Th

Vedclass · Accepted Answer

By mass flow involving carriers and $ATP$

Vedclass · Answer

(B) The translocation of organic solutes (mainly sucrose) in the phloem sieve tubes occurs via the pressure-flow hypothesis or mass flow hypothesis.This process involves the active loading of sucrose into the sieve tube elements at the source,which creates a high osmotic pressure.Water enters the sieve tubes from the adjacent xylem by osmosis,creating a hydrostatic pressure gradient.This pressure gradient drives the mass flow of the phloem sap from the source to the sink,where the solutes are unloaded.Thus,it is a mass flow mechanism involving the expenditure of $ATP$ for active transport.

The translocation of organic solutes in sieve tubes occurs through which mechanism?

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