Transport in plantsHard

Question

Some of the growth regulators affect stomatal opening. closure of brought about by

Options

A.indole butyric acid
B.abscisic acid
C.kinetin
D.gibberellic acid

Solution

Abscisic acid promotes reversal of H+ ⇋ K+ pump and increasing availability of H+ inside the guard cell cytoplasm. Loss of K+ decreases osmotic concentration of guard cells as compared to adjacent epidermal cells. Due to exosmosis the turgidity of guard cells decreases and it closes the of stoma.

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