Which risk increases when CAM plants fix CO2 at night in arid climates?

💡 Explanation

When CAM plants fix CO2 at night, stomata open to reduce water loss but stored malate must be respired to provide energy for CO2 fixation lowering their energy reserves. Therefore respiration depletes stored malate, rather than photoinhibition which requires overexposure, or changes in water use/Rubisco's immediate functions.

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