Discussion
Denitrification is a process of :
Answer: D
Denitrification is a process of Reduction.
Under low-oxygen conditions, bacteria such as Pseudomonas use nitrate in place of oxygen as the electron acceptor for respiration, reducing it step by step:
\[ \begin{aligned} &\mathrm{NO_{3}^{-} \rightarrow NO_{2}^{-} \rightarrow NO} \\ &\rightarrow \mathrm{N_{2}O \rightarrow N_{2}} \end{aligned} \]
Nitrogen goes from oxidation state +5 to 0 and returns to the atmosphere. The opposite process, nitrification of ammonium to nitrate, is the oxidation. Hydration (adding water) and carbonation (reaction with carbonic acid) are weathering reactions, unrelated to the nitrogen cycle.
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