Which metabolic outcome is favored when a plant's stomata remain closed for extended periods?

💡 Explanation

When stomata are closed for long, CO2 decreases and O2 increases inside the leaf, favoring photorespiration because RuBisCO binds to O2 instead of CO2. Therefore photorespiration increases, rather than optimal Calvin cycle, electron transport, or ATP and NADPH synthesis which require efficient CO2 fixation.

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