Assertion :Application of cytokinins causes the opening of stomata. Reason: Cytokinins induce the influx of potassium ions into guard cells.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Cytokinin is a plant hormone. It is produced by the roots and travel upwards through the xylem, that promote tissue growth and budding and on application, retard plant senescence. Cytokinin promote stomatal opening and thereby transpiration by inducing the accumulation of more potassium ion concentration in the guard cells.
Thus, the correct answer is option A.

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