Which outcome arises when a CAM plant's phosphoenolpyruvate carboxylase (PEPCase) activity is inhibited at night?

💡 Explanation

When PEPCase is inhibited at night in CAM plants, the dark reactions necessary for storing carbon in malate, via the initial carboxylation of phosphoenolpyruvate, cannot properly occur because PEPCase mediates that carbon uptake. Therefore, reduced malate production occurs, rather than increased fixation, stomatal changes, or photorespiration, which are related to daytime processes or Rubisco's function.

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