Which outcome occurs when CAM pathway enzyme phosphoenolpyruvate carboxylase (PEPcase) malfunctions?

💡 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.

• Which consequence results when insufficient ecdysone secretion occurs?
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• Which outcome leads to reduced nutrient uptake during high humidity?
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