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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

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