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Q.

The opening and closing of the stomatal pore depends upon

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a

Oxygen

b

Temperature 

c

Concentration of carbon dioxide in stomata

d

Water in guard cells

answer is D.

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Detailed Solution

During night due to unavailability or scarcity of water the stomata remain close as the guard cell becomes flaccid. Therefore, we can say that the opening and closing of the stomatal pore depends upon the water in guard cells

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