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B
Endosmosis
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C
Fall in turgor
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D
Loss of water
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Solution
The correct option is A Exosmosis The correct answer is exosmosis.
The cause of the opening or closing of the stomata in a change in the turgidity of the guard cells. During the day time, guard cells experience exosmosis i.e. movement of molecules from the region of higher concentration to lower.