AP BIOLOGY

Detailed explanation-1: -In desert plants, the stomata is open during night. During night, desert plants absorb carbon dioxide and form an intermediate. Then during day time when the stomata is closed to prevent loss of water, they use this stored carbon dioxide to perform photosynthesis.

Detailed explanation-2: -There is not much water available in the desert. This means that plants have to get most of their moisture from the air. They do this by opening their stomata, tiny pores in their leaves, during the night when it is cooler and there is more humidity in the air.

Detailed explanation-3: -In succulent plants like Cacti and Bryophyllum, the stomata remain open during night and closed during the day to reduce transpiration. This kind of stomatal behavior is termed scotoactive.

Detailed explanation-4: -But the plants found in deserts perform photosynthesis in the night time to produce carbon dioxide. It is simply due to the climate of deserts. In deserts, the climate is very hot during day time and the amount of rainfall is low, isn’t it? So to prevent the water loss they perform photosynthesis during night time.