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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.

Section $A$	Section $B$
$(i)$ Nitrosomonas	$(a)$ Nitrite $\rightarrow$ Nitrate
$(ii)$ Agrobacterium	$(b)$ Nitrogen fixative bacteria
$(iii)$ Rhizobium	$(c)$ $NO_3^- \rightarrow N_2$
$(iv)$ Nitrobacter	$(d)$ Ammonia $\rightarrow$ Nitrite
	$(e)$ Denitrifying bacteria

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

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