Question

Stomata of CAM plants:

• A. Are always open
• B. Open during the day and close at night
• C. Open during the night and close during the day
• D. Never open

Answer 1

The correct option is C Open during the night and close during the day

To conserve water, the stomata of CAM plants open only during the night. During the night, the CAM plants take up $C{O}_2$ and store it in the form of malic acid which is utilized during the daytime in photosynthesis.