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← Nature & AnimalsWhich outcome occurs when persistent high temperatures inhibit the enzyme phosphoenolpyruvate carboxylase (PEPcase) in a C4 plant?
A)Photorespiration rate increases significantly✓
B)Rubisco efficiency becomes substantially boosted
C)Stomata open more widely, increasing water loss
D)CAM pathway gains relative photosynthetic advantage
💡 Explanation
When PEPcase is inhibited by high temperature, C4 plants can no longer effectively concentrate CO2, leading to a relative deficit of CO2 near Rubisco, which normally prevents photorespiration. Therefore, photorespiration increases, rather than other effects dependent on independent mechanisms under different conditions.
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