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Question

Desert plants take up CO2 during _____ .

A
Early morning
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B
Evening
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C
Night
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D
Afternoon
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Solution

The correct option is B Night
  • Desert plants have a special mechanism known as CAM metabolism (Crassulacean acid metabolism).
  • During day the stomata are closed to conserve water molecules. At nights, the Carbon dioxide is converted to an acid and stored.
  • This acid is then utilized by plants during photosynthesis at day time.
Hence, Desert plants like cactus and agaves take up CO2 at night time.
Option 'C' is correct.

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