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Guard cells are responsible for openin...

Guard cells are responsible for opening and closing of the stomata

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(i ) Stomata are open in the day and closed at night . The opening and closing of tha stomata is due to the change in turgidity of the guard cells .
(ii ) when water enters into the guard cells , they become turgid and the stoma open when the guard cells lose water , it becomes flaccid and the stoma closes.
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