Which factor directly regulates the opening and closing of stomata?

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

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

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Explanation

The stomata open and close primarily in response to light. Light triggers guard cells to change shape, controlling the stomatal aperture. Temperature and pH do not directly regulate stomatal movement.

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