What process occurs at night for CAM plants?

The process that occurs at night for CAM (Crassulacean Acid Metabolism) plants involves the conversion of carbon dioxide (CO2) into malate. This unique adaptation allows CAM plants to survive in arid environments by minimizing water loss during the daytime.

At night, when it's cooler and more humid, CAM plants open their stomata to take in CO2 from the atmosphere. Instead of immediately using it for photosynthesis, they convert the CO2 into organic acids, primarily malate, which is stored in vacuoles. This process is crucial because it allows the plants to store carbon for use during the day when the stomata are closed to prevent water loss but photosynthesis can still occur using the stored malate.

This method of carbon storage and use is a significant adaptation for CAM plants, enabling them to thrive in conditions where water availability is limited. Thus, the conversion of CO2 into malate at night is essential for the plant's photosynthetic strategy and overall survival.