Which outcome occurs when a C4 plant experiences prolonged drought conditions affecting phosphoenolpyruvate carboxylase regulation?

💡 Explanation

When C4 plants experience drought, phosphoenolpyruvate carboxylase regulation is disrupted because reduced water availability impacts enzyme functionality, leading to decreased carbon fixation efficiency. Therefore, photorespiration increases, rather than CAM shift which requires genetic predisposition, chloroplast rupture which is unrelated, or biomass increase which is a long-term adaptation.

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