A) \[C{{a}^{2+}}\]
B) \[N{{a}^{+}}\]
C) \[{{K}^{+}}\]
D) \[M{{n}^{2+}}\]
Correct Answer: C
Solution :
The malic acid in the guard cell dissociate into H~ and malate. H pass out of the guard cells in exchange of \[{{K}^{+}}\] Some \[{{K}^{+}}\] also absorbed actively from adjacent epidermaj cell with the help of cAMP, ATP and cytokinin. The osmotic concentration of guard cell increase, as a result guard cells absorb water from nearby epidermal cell through endosmosis, swellup and stomatal pore open.
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