Opening and closing of stomata is due to which of the following ions?

{C a}^{2 +}

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{N a}^{+}

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K^{+}

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{C l}^{-}

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Solution

The correct option is C $K^{+}$
Potassium ions movement into and out of guard cells is related to the turgidity and consequent opening and closing of stomatal pore. Formation of organic acids like malic acid in guard cells promotes intake of potassium into the guard cells, which causes a decrease in water potential leading to intake of water by guard cells.
Thus, the correct answer is option C.

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Question 15

Which of the following ions will cause hardness in water sample?

(a) $C a^{2 +}$ (b) $N a^{+}$ (c) $C l^{-}$ (d) $K^{+}$

K^{+}

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