A decrease in carbon dioxide concentration primarily promotes which response in 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

When CO2 levels inside the leaf are low, stomata tend to open to allow more gas exchange. Conversely, high CO2 levels usually cause stomatal closure.

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