Question

Give reason :- why stomata closes and opens
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Answer 1

Answer:

to prevent transpiration

Explanation:

stomata opens for photosinthesis. but transpiration occurs in background of photosinthesis. thus as simple defenition stomata closes due to lower water content and as complex defenition due to K+ ion theory and sugar concentration theory

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Answer 2

Answer:

The opening and closing of stomata is governed by increases or decreases of solutes in the guard cells, which cause them to take up or lose water, respectively. In general, stomata open by day and close at night. ... The openingor closing of stomata occur in response to signals from the external environment.