MCQ
$CO_2$ is formed in all of the following except
  • A
    Burning of sugar
  • B
    Respiration in plants
  • Photosynthesis by plants
  • D
    On heating of limestone

Answer

Correct option: C.
Photosynthesis by plants
c
(c) Burning of sugar, respiration in plants and heating of limestone is responsible for the liberation of $CO_2$ but in photosynthesis green plants take in $CO_2$ and release $O_2$ thus purifying the air.

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