The organisms, which participate most actively in nitrogen cycle in nature are
A
Saprophytic angiosperms
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B
Parasitic fungi
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C
Bacteria
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D
Cereals
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Solution
The correct option is C Bacteria
Bacteria help to fix atmospheric nitrogen, either independently (Azotobacter) or in a symbiotic association (Rhizobium) and make it available to the plants.
Bacteria break down the proteins present in the bodies of plants and animals into ammonia through the process of decay.
The next step is nitrification. This is carried out by two types of bacteria, Nitrosomonas and Nitrobacter. Nitrosomonas converts ammonia to nitrite and Nitrobacter converts nitrite to nitrate.
The last step of the nitrogen cycle is denitrification. In this, ammonia oxidizing bacteria convert nitrates into nitrogen.