Oxygen is returned to the atmosphere mainly by___.

Burning of fossil fuels

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Respiration

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Photosynthesis

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Thunder storm

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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. Here, oxygen is given out as a by-product. This is the process which 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

Oxygen is returned to the atmosphere mainly by

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