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Q.

Which of the following cellular structures regulate the opening and closing of stomata in plants?

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a

Peroxisome

b

Guard cells 

c

Vacuoles

d

Mitochondria

answer is B.

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Detailed Solution

The opening of stomata is primarily controlled by the turgor pressure of the guard cells that surround the stomatal pore. When the water enters the guard cells its water potential increases, causing them to swell and bend apart, which opens the stomatal pore.

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