Reaction carried out by N_{2} metabolising mi | vedclass

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(D) The reactions provided represent the process of nitrification,which is the conversion of ammonia into nitrates.Step $I$ $(2 NH_{3} + 3 O_{2} \righ

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Bacteria carrying out these steps are usually photoautotrophs

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(D) The reactions provided represent the process of nitrification,which is the conversion of ammonia into nitrates.Step $I$ $(2 NH_{3} + 3 O_{2} \rightarrow 2 NO_{2}^{-} + 2 H^{+} + 2 H_{2} O)$ is performed by bacteria such as $Nitrosomonas$ or $Nitrococcus$.Step $II$ $(2 NO_{2}^{-} + O_{2} \rightarrow 2 NO_{3}^{-})$ is performed by $Nitrobacter$.Both steps together are collectively known as nitrification.The bacteria involved in these processes are chemoautotrophs,not photoautotrophs,as they obtain energy by oxidizing inorganic substances rather than using light energy. Therefore,the statement that they are photoautotrophs is incorrect.

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

Reaction carried out by $N_{2}$ metabolising microbes include:
$I.$ $2 NH_{3} + 3 O_{2} \rightarrow 2 NO_{2}^{-} + 2 H^{+} + 2 H_{2} O$
$II.$ $2 NO_{2}^{-} + O_{2} \rightarrow 2 NO_{3}^{-}$
Which of the following statements about these equations is not true?

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Reaction carried out by $N_{2}$ metabolising microbes include:$I.$ $2 NH_{3} + 3 O_{2} \rightarrow 2 NO_{2}^{-} + 2 H^{+} + 2 H_{2} O$$II.$ $2 NO_{2}^{-} + O_{2} \rightarrow 2 NO_{3}^{-}$Which of the following statements about these equations is not true?