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Stomata: Opening and Closing

According to ...

Question

According to the Steward's starch hydrolysis theory, which one of the following is the principle reason for the opening of stomata during daytime?

Influx of

K^{+}

ions guard cells under the influence of ABA hormone

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Conversion of sugar into starch in guards cells

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Efflux of

K^{+}

ions from guards cells under the influence of ABA hormone

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Photosynthesis utilization of

C O_{2}

in guard cells

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Solution

The correct option is D Photosynthesis utilization of $C O_{2}$ in guard cells
During daytime photosynthesis occurs in guard cells, this decreases carbon dioxide concentration and increases pH leading to the conversion of starch into malic acid and protons-potassium ion exchange between subsidiary cells and guard cells. The potassium ions are osmotically active and lead to the influx of water into guard cells, thus making them turgid and stoma opens. During the dark, all of the above processes are reversed.

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