Answer :

Nitrogen gas becomes converted into biologically usable chemical forms by bacteria.

Nitrogen gas is majorly present in the environment. It constitutes around 78% of the atmosphere. This gas is captured by the plants for their use. The gas is not used in its natural form but instead it is converted into forms like nitrate, nitrite or ammonium ions.

Bacteria are the microorganisms that are omnipresent in the Earth. There are both good as well as bad forms of bacteria. One such good form of bacteria are the nitrifying bacteria. They are usually present inside the roots of plants and help in nitrogen fixation. The examples of such bacteria are: Rhizobium, Blue-green algae, etc.

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