Transport in plantsMedium
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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