Which risk increases when CAM plants close stomata during daylight hours in hot arid environments?

💡 Explanation

When CAM plants close stomata to conserve water, photorespiration increases because CO2 fixation decreases relative to O2 fixation due to Rubisco's affinity, depleting internal carbon stores in the plant. Therefore, CO2 depletion leading to photorespiration occurs, rather than nitrogen fixation failure, embolism formation or oxygen deficiency, which result from insufficient gas concentration thresholds.

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