Which effect disrupts crassulacean acid metabolism (CAM) in succulents under consistently humid conditions?

💡 Explanation

Under consistently humid conditions, CAM plants experience decreased transpiration because the high humidity reduces the water potential gradient driving transpiration, preventing stomata from opening during the night to fix CO2. Therefore, reduced nocturnal malate accumulation results, rather than daytime CO2 limitation, high internal O2, or reduced RuBisCO efficiency, because those stem from different mechanisms or conditions.

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