Their stomata during the day!.
stomata
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All plants use guard cells to control how long stomata should be opened or closed. CAM plants, for example, close their stomata during the day to prevent loss of water.
Any plant that performs CAM photosynthesis. It occurs mostly in desert plants, such as cacti, to preserve water.
CAM
Cam plants close during the night and open during the day because they are photosensitive and respond to light. To do it experimentally, try with a torch for some time.
stomata
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Cam plants close during the night and open during the day because they are photosensitive and respond to light. To do it experimentally, try with a torch for some time.
All plants use guard cells to control how long stomata should be opened or closed. CAM plants, for example, close their stomata during the day to prevent loss of water.
At night, the leaves of C3 plants close their stomata and wait until the sunlight. For CAM plants, this is when the plants open their stomata and allow the carbon dioxide to come in.
Cactus
Many plants, called C3 and C4 plants, open their stomas during the day to let in carbon dioxide to instigate the process of cellular respiration. However some plants called CAM plants open their stomas at night. The main reason for this process is due to the physical environment the plants are located in. The majority of CAM plants are located in hot, dry and desert environments where water is scarce. As a result the CAM plants evolved so that they could close their stomas during the day and open them at night, to help retain water, at night the plants can still absorb CO2. Some examples of CAM plants are, cacti, pineapples, and aloe.
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Most CAM plants are found in Hot and Dry climates according to my Bio book
Pineapples and cactus.
CAM plants include many succulents such as cactuses and agaves and also some orchids and bromeliads