Air in the earth atmosphere is a mixture of gases comprising 78% nitrogen and 21% oxygen with traces of water vapour, carbon dioxide, argon and various other components. Which component of air can be used directly by living beings?
A)oxygen
B)nitrogen
C)carbon dioxide
D)water vapour
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Answer:
A. Oxygen
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The oxygen component present in the air can be directly used by the living beings.
Oxygen is required by all the living organisms to perform all the life processes. Oxygen is intaken during respiration and is delivered to all parts of the body by the circulating fluid called blood.
A bacteria named Mycoplasma can survive even without oxygen. These cells are the smallest ones.
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