Accumulation of which one of the following acids results in closure of stomata?

Malic acid

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Aspartic acid

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PEP

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OAA

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Solution

The correct option is D Malic acid
When there is the rise in pH it causes hydrolysis of starch into sugar which accumulates in guard cells which results in the opening of cells. For this mechanism, cytokinins, malic acid, and cAMP are required.
Abscisic acid is the stress hormone which results in the closing of stomata.
So, the correct answer is 'Malic Acid'.

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