Oxygen is returned to the atmosphere mainly by which of the following?

burning of fossil fuel

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respiration

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photosynthesis

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fungi

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Solution

The correct option is C
photosynthesis

Photosynthesis is a process by which plants convert carbon dioxide into glucose in the presence of sunlight and oxygen is given out as a by product. This process is mainly responsible for the release of oxygen into the atmosphere.

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Question 24
Oxygen is returned to the atmosphere mainly by:

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

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