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Which outcome follows when water availability sharply drops within a CAM photosynthetic pathway?

A)Reduced light-independent reaction efficiency
B)Increased RuBisCO oxygenase activity
C)Elevated mesophyll CO2 concentration
D)Complete stomatal closure is averted

💡 Explanation

The light-independent reactions diminish because CAM photosynthesis relies on malate decarboxylation at a later time. A decline in water inhibits the initial CO2 uptake, therefore starving the Calvin cycle, rather than affecting oxygenase activity directly.

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