How many hypotheses have been proposed to explain the mechanisms behind stomatal opening and closing?

Biology Mcqs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

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Subject
Biology Mcqsbiology-mcqs
Published
3 Jun 2018
Last updated
28 May 2026

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Explanation

There are two main hypotheses that describe the processes responsible for the opening and closing of stomata.

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