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← Nature & AnimalsWhich outcome occurs when CAM pathway enzyme phosphoenolpyruvate carboxylase (PEPcase) malfunctions?
A)Impaired early dark CO2-fixation rates✓
B)Overactive day-time Rubisco efficiency
C)Substantially increased evaporative water-loss
D)Excessive buildup of toxic photorespiration
💡 Explanation
When PEPcase is defective, nocturnal fixing of CO2 in CAM plants is hindered because PEPcase facilitates the initial conversion of phosphoenolpyruvate to oxaloacetate, essential for carbon storage as malic acid. Therefore CO2-fixation rates are lessened, rather than enhanced Rubisco activity, increased water loss, or buildup of photorespiration which all depend on later photosynthetic stages.
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