Oxygen Cycle


 
 
Concept Explanation
 

Oxygen Cycle

Concentration of oxygen in air: The concentration of oxygen in the atmosphere is about 21%. It is one of the constituents of water. Oxygen is cycled in the living world through respiration and photosynthesis. All living organisms take in oxygen for respiration. During this process food is oxidized, energy is produced and carbon dioxide is released into the atmosphere. Carbon dioxide is used by green plants to produce food materials during photosynthesis. Oxygen is released in this process as a by-product. Some of the oxygen also gets incorporated into the food materials.

Oxygen cycle: Oxygen is also cycled during burning and combustion. Oxygen is consumed in the burning of materials and carbon dioxide is released during this process. Oxygen combines with nitrogen and forms nitrogen oxides, amino acids, proteins, etc. These compounds release oxygen in the atmosphere when they are broken down. Thus, the oxygen level is balanced in the environment.

                                 

Sample Questions
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Question : 1

Which of the following are correct :

(a) Plant produce oxygen during photosynthesis and utilize oxygen during respiration.

(b) Oxygen is released during the process of combustion.

Right Option : A
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Question : 2

The balance of oxygen and carbon dioxide in the atmosphere is maintained through _____________ in plants and animals and by ______________ in plants.

Right Option : A
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Explanation
Question : 3

Balance of oxygen and carbon dioxide in air is maintained by ________________________________

Right Option : C
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Explanation
 
 


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