Question

stomata of a desert plant remain closed during day time how do they take up co2 and perform photosynthesis

Answer 1

desert plants take up carbondioxide during night time and prepare an intermediate which is acted upon the engery absorbed by the chlorophyll during the day

Answer 2

In desert plants, the stomata is open during night. During night, desert plants (also called xerophytes) absorb co2 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.
Desert plants take up CO2 at night and prepare an intermediate molecule. The intermediate molecule is acted upon it and absorbed by the chlorophyll during day.