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  • Oxygen is returned to the atmosphere mainly by (a) burning of fossil fuel (b) respiration (c) photosynthesis (d) fungi

Oxygen is returned to the atmosphere mainly by

(a) burning of fossil fuel
(b) respiration
(c) photosynthesis
(d) fungi

Answers (1)

Oxygen is released mainly by photosynthesis, which involves the consumption of carbon dioxide. Respiration is a catabolic process while photosynthesis is an anabolic process. During respiration oxygen is taken and carbon dioxide is given out while during photosynthesis carbon dioxide is taken and oxygen is given out. During photosynthesis, carbon dioxide is fixed to form carbohydrates by the dark reaction. The water molecules are broken down during the light reaction and release oxygen. Thus, the two processes help to maintain the balance of oxygen and carbon dioxide in the atmosphere.
Hence, the correct option for this question is option C. 

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