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Question

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.
Thus, the correct answer is 'Bacteria.'

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