What does the term 'denitrification' mean?

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Question

(D) Denitrification is a biological process in which nitrate $(NO_3^-)$ or nitrite $(NO_2^-)$ is reduced to gaseous nitrogen $(N_2)$ or nitrous oxide

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Conversion of nitrates and ammonia to gaseous nitrogen in the soil

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(D) Denitrification is a biological process in which nitrate $(NO_3^-)$ or nitrite $(NO_2^-)$ is reduced to gaseous nitrogen $(N_2)$ or nitrous oxide $(N_2O)$.This process is carried out by denitrifying bacteria such as $Pseudomonas$ and $Thiobacillus$ in the soil under anaerobic conditions.It is a crucial step in the nitrogen cycle that returns nitrogen to the atmosphere.

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