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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)

Answer: C

Solution.

Oxygen has been 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 carbohydrate by the dark reaction. The water molecules are broken down during the light reaction and release oxygen. Thus, the two process helps to maintain the balance of oxygen and carbon dioxide in the atmosphere.
Hence, the correct option of this question is option C

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