Question

In CAM plants, stomata are:

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

Answer 1

The correct option is B

Open during night and close during day

Crassulacean acid metabolism, also known as CAM photosynthesis, is a carbon fixation pathway that evolved in some plants as an adaptation to arid conditions. In a plant using full CAM, the stomata in the leaves remain shut during the day to reduce evapotranspiration, but open at night to collect carbon dioxide (CO₂).