Answer :
Denitrification is the process by which nitrogen is converted back into its gaseous state in the nitrogen cycle.
Denitrification is the process of converting nitrate to nitrogen gas, which removes bioavailable nitrogen from the environment and returns it to the atmosphere. Denitrification is the process by which nitrate (NO3-) is converted back to gaseous nitrogen to complete the nitrogen cycle (N2). The agents of this process are denitrifying bacteria. These bacteria obtain energy from nitrate rather than oxygen, releasing nitrogen gas into the atmosphere. When organisms expel waste or die and are decomposed by bacteria and fungi, nitrogen returns to the soil. Bacteria generate energy by breaking down nitrate and nitrite into nitrogen gas, which is then released back into the atmosphere.
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