What characterizes CAM photosynthesis?

CAM photosynthesis, or Crassulacean Acid Metabolism, is characterized by the opening of stomata only at night. This adaptation is crucial for plants that are in arid environments where water conservation is vital. By opening their stomata at night when temperatures are cooler and humidity is generally higher, these plants minimize water loss that would otherwise occur during the hotter daytime hours.

At night, these plants take in carbon dioxide and convert it into organic acids, which are stored until daylight. During the day, the stomata remain closed to prevent water loss, and the plants utilize the stored CO2 for photosynthesis. This unique adaptation allows CAM plants to thrive in conditions that would be detrimental to other types of photosynthetic pathways, such as C3 and C4.