Certain bacteria present in soil can convert atmospheric into usable compounds.
A
Carbon dioxide
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B
Nitrogen
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C
Oxygen
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D
Water vapour
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Solution
The correct option is B
Nitrogen
Certain bacteria present in soil can convert atmospheric nitrogen into usable compounds which can be taken up and used by plants.
Animals obtain nitrogen from plant and animal sources of food.
Nitrogen forms a basic building block of proteins in the bodies of all organisms. It is essential for the growth and development of plants and animals.