Which metabolic shift occurs when prolonged drought forces plants to extensively close their stomata?

💡 Explanation

When stomata close extensively during drought, CO2 entry decreases and O2 accumulates, increasing photorespiration because Rubisco binds O2 instead of CO2, forming glyoxylate. Therefore, photorespiration increases, rather than increased glycolysis, decreased Calvin cycle, or nitrogen fixation, which are not directly CO2-limited processes.

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