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?

Similar Questions

Assertion : Long distance flow of photoassimilates in plants occurs through sieve tubes.
Reason : Mature sieve tubes have parietal cytoplasm and perforated sieve plates.

The concentration of xylem sap is:

According to the pressure flow hypothesis:
$A.$ Phloem loading produces a hypertonic condition in the sieve tubes.
$B.$ Water potential gradient facilitates the mass movement in the phloem.
$C.$ Phloem unloading is a passive process.

What does the xylem and phloem sap contain?

What is the direction of movement of sugars in phloem?

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