A : Auxin treatment causes acidification of t | vedclass

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(A) According to the acid growth hypothesis,auxin stimulates the proton pumps in the plasma membrane,which increases the concentration of $H^+$ ions i

Vedclass · Accepted Answer

Assertion and Reason both are correct and Reason is the correct explanation of Assertion.

Vedclass · Answer

(A) According to the acid growth hypothesis,auxin stimulates the proton pumps in the plasma membrane,which increases the concentration of $H^+$ ions in the cell wall,leading to acidification.This acidic environment activates cell wall-loosening enzymes known as expansins.These enzymes break the hydrogen bonds between cellulose microfibrils,causing the cell wall to loosen.This loosening allows the cell wall to extend under turgor pressure,resulting in cell elongation.Therefore,both the Assertion and the Reason are correct,and the Reason correctly explains the mechanism behind the Assertion.

$A$ : Auxin treatment causes acidification of the cell wall and helps in cell elongation.
$R$ : Loosening of cell wall microfibrils occurs.

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$A$ : Auxin treatment causes acidification of the cell wall and helps in cell elongation.$R$ : Loosening of cell wall microfibrils occurs.