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.
Which of the following are correct : (a) Oxygen gets removed from the air during respiration and burning. (b) The balance of oxygen and carbon dioxide in the atmosphere is maintained through respiration in plants and animals and by photosynthesis in plants. | |||
Right Option : C | |||
View Explanation |
Balance of oxygen and carbon dioxide in air is maintained by ________________________________ | |||
Right Option : C | |||
View Explanation |
Oxygen gets _____________ from the air during respiration and burning. | |||
Right Option : D | |||
View Explanation |
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