Question

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

Answer 1

I desert plants stomata is open during night .  During night desert plants absorb CO₂ and form a intermediate which is used in the day for photosynthesis 

Answer 2

In desert plants stomata is open during night so they absorb CO2in the night and immedietly absorb sunlight in the daytime to prepare food