Which adjustment does a plant using CAM pathways employ to minimize water loss?

💡 Explanation

When water is scarce, CAM plants temporally separate carbon fixation and the Calvin cycle by opening stomata at night for CO2 uptake because this reduces water loss by transpiration when air is cooler and more humid. Therefore, closing stomata during daylight is the result, rather than root, direct xylem transport or wax alterations, which act via different mechanisms.

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