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Question
Which one of the following helps in the opening of stomata?
Options
Cobalt ions
Potassium ions
Magnesium ions
Aluminium ions
Solution
Potassium ions
Explanation:
Potassium ions play a part in opening and closing the stomata holes. Guard cells become hypertonic and water enters them as the K+ ion concentration rises there. This swells them, and when the membrane stretches, the stomata pore opens. In the shutting of stomata, the reverse occurs. K+ ion concentration lowers; the cell becomes hypotonic and water leaves the cell, flaccid.
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