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Nature & Animals

In a drought, which adjustment by CAM plants allows survival amid water scarcity?

A)Closing stomata during the daytime
B)Increasing root surface area
C)Lowering leaf surface temperature
D)Enhancing xylem vessel diameter

💡 Explanation

During drought, water loss reduction is critical; CAM plants minimize this by temporal separation of carbon fixation, opening stomata at night to fix CO2 and closing them during the day to reduce transpiration. Therefore closing stomata during the daytime protects against water loss rather than processes optimizing water uptake.

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