Which two distinct microbial processes are re | vedclass

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(D) : Denitrification is a biological process in which nitrates $(NO_3^-)$ in the soil are reduced to molecular nitrogen $(N_2)$ gas, which is then re

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Anaerobic ammonium oxidation and denitrification.

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(D) : Denitrification is a biological process in which nitrates $(NO_3^-)$ in the soil are reduced to molecular nitrogen $(N_2)$ gas, which is then released into the atmosphere. This process is carried out by denitrifying bacteria such as $Pseudomonas 	ext{ } denitrificans$ and $Thiobacillus 	ext{ } denitrificans$. Additionally, the anaerobic oxidation of ammonium $(NH_4^+)$, also known as the $Anammox$ process, involves the conversion of ammonium and nitrite directly into dinitrogen gas $(N_2)$ under anaerobic conditions.

Column $I$	Column $II$
$A$. Thiobacillus	$1$. Free-living nitrogen-fixing cyanobacteria
$B$. Nitrosomonas	$2$. Denitrification
$C$. Nostoc	$3$. Free-living aerobic nitrogen-fixing bacteria
$D$. Azotobacter	$4$. $NH_{3}$ to Nitrite

Which two distinct microbial processes are responsible for the release of fixed nitrogen as dinitrogen gas $(N_2)$ to the atmosphere?

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