A) Burning of sugar
B) Respiration in plants
C) Photosynthesis by plants
D) On heating of limestone
Correct Answer: C
Solution :
Burning of sugar, respiration in plants and heating of limestone is responsible for the liberation of\[C{{O}_{2}}\]but in photosynthesis green plants take in\[C{{O}_{2}}\]and release\[{{O}_{2}}\]thus purifying the air.
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