Active transport of solute in plants refers t | vedclass

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(B) Active transport involves the movement of molecules against their concentration gradient,which requires metabolic energy. In plant cells,this ener

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Not only from $ATP$ hydrolysis but also from the collapse of a proton motive force

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(B) Active transport involves the movement of molecules against their concentration gradient,which requires metabolic energy. In plant cells,this energy is primarily provided by $ATP$ hydrolysis. However,many transport processes,such as the loading of sucrose into phloem sieve tubes,utilize a proton gradient ($H^+$ gradient) established by $H^+-ATPases$. The subsequent movement of solutes (like sucrose) is coupled with the movement of protons down their electrochemical gradient (proton motive force). Therefore,the energy for active transport is derived from both $ATP$ hydrolysis and the collapse of the proton motive force.

Property	Simple Diffusion	Facilitated Transport	Active Transport
Requires special membrane proteins	No	$a$	Yes
Transport saturates	No	Yes	$b$
Uphill transport	$c$	No	Yes
Requires $ATP$ energy	No	No	$d$

Active transport of solute in plants refers to the flow of solutes against a concentration gradient and therefore requires an input of energy. This energy is derived:

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