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Nature & Animals

Which metabolic shift occurs when a C3 plant experiences prolonged drought conditions?

A)Increased photorespiration due to stomatal closure
B)Enhanced nitrogen fixation by root nodules
C)Decreased chlorophyll production for energy conservation
D)Upregulation of mitochondrial ATP synthesis

💡 Explanation

When a C3 plant experiences drought, stomatal closure conserves water but limits CO2 intake, increasing O2 concentration and photorespiration because Rubisco binds to O2 instead of CO2. Therefore, increased photorespiration occurs, not nitrogen fixation, less chlorophyll, or more ATP synthesis which operate through different pathways.

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