A) \[C{{a}^{2+}}\]
B) \[N{{a}^{+}}\]
C) \[{{K}^{+}}\]
D) \[C{{l}^{-}}\]
Correct Answer: C
Solution :
According to ATP-driven proton \[({{H}^{+}})-{{K}^{+}}\] exchange pump hypothesis of Levitt, there is accumulation of \[{{K}^{+}}\] in the guard cells during day time. The malic acid produced from phosphoenol pyruvate dissociates to produce. \[{{H}^{+}}\] and malate. The \[{{H}^{+}}\] pumped out while \[{{K}^{+}}\] umped in from the adjacent subsidiary cell. \[{{K}^{+}}\]combines with malate and guard cells absorb water lead to opening of stomata. Calcium \[(C{{a}^{2+}})\] is component of middle lamella. It helps to stabilise the structure of chromosome, required for development of root apex and shoot apex. \[C{{l}^{-}}\] is required for photolysis of water, solute concentration and ionic balance.
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