CBSE Class 10 Answered

CAM plants/ desert plants open their stomates for gas exchange at night and store carbon dioxide in the form of an organic acid. During the day the stomates are closed and the plants are nearly completely sealed against water loss; photosynthesis is conducted using the stored carbon dioxide.

During nights, the temperature is lower, so carbon dioxide is taken in to facilitate organic acid production. Higher temperatures stimulate release of carbon dioxide from the acid.

Cool nights allow much carbon dioxide to be stored as acid, and the warm days cause most of the carbon dioxide to be released for photosynthesis