Question

Mention the three processes in which oxygen is used up from the atmosphere and the
process in which it is returned to the atmosphere.

Answer 1

Answer:

Oxygen from the atmosphere is used up in three processes, namely combustion, respiration and in the formation of oxides of nitrogen. Oxygen is returned to the atmosphere by the process called as photosynthesis.

Explanation:

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Answer 2

The question is answered below-

1. Oxygen is the most essential for sustaining life on earth. Three processes in which oxygen is used up from the atmosphere are listed below-

a. respiration - Every living thing on earth uses oxygen for breathing. Oxygen primarily serves respiratory purposes.

b. combustion-  The process of burning utilizes the oxygen from the atmosphere.

c. decomposition- It is another crucial process to balance the ecosystem which, again uses oxygen to back up the procedure.

2. Oxygen is returned to the atmosphere with the help of the process of photosynthesis executed by the plants and the trees. The procedure of photosynthesis involves composing food for the plants where they use up carbon dioxide, sunlight, and chlorophyll and release oxygen in return.