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(C) The correct answer is $C$. Bacteria play the most active role in the nitrogen cycle through various processes:$1$. Nitrification: Ammonium compoun

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Bacteria

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(C) The correct answer is $C$. Bacteria play the most active role in the nitrogen cycle through various processes:$1$. Nitrification: Ammonium compounds are oxidized into nitrates in two stages. First,nitrite bacteria (e.g.,$Nitrosomonas$) oxidize ammonia into $NO_2^-$. Second,nitrate bacteria (e.g.,$Nitrobacter$) oxidize $NO_2^-$ into $NO_3^-$,which plants can absorb.$2$. Nitrogen Fixation: Bacteria like $Rhizobium$ (in root nodules of legumes),$Azotobacter$,and cyanobacteria fix atmospheric nitrogen into organic forms.$3$. Denitrification: Bacteria like $Pseudomonas$ convert nitrates back into atmospheric nitrogen $(N_2)$,completing the cycle.

The organisms which participate most actively in the nitrogen cycle in nature are

Similar Questions

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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Define the following terms:
$(1)$ Ammonification
$(2)$ Nitrogen Fixation

Denitrification is carried out by bacteria $......$ and $......$.

The bacteria which convert $NO_3^- \rightarrow$ free $N_2$ are called as:

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