for example desert plants take up carbon dioxide at night and prepare and intermediate which was acted upon by the energy absorbed by the chlorophyll during the day,, explain this line

Dear student,
Please find below the answer:

The statement means that, in cactus plants that live in deserts, the temperature is too hot. The plants have adapted themselves to the environment in order to prevent loss of water from the plant body. Their stomata remain closed during the daytime, the closing of stomata also prevents the entry of CO2, the stomata opens up only in the nighttime because of some special enzymes and the carbon dioxide turns into oxaloacetic acid having 4 carbons. During the daytime, they put the stored CO2 into the Calvin cycle.

Hope this clears your doubt.
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