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Question
The process which involves the conversion of nitrates in the soil into atmospheric nitrogen is known as ______.
Options:
A .  nitrification
B .  denitrification
C .  ammonification
D .  nitrogen fixation
Answer: Option B
:
B
The nitrates which are formed by the process of nitrification are utilized by the plants. The excess nitrates in the soil are released back in the atmosphere as atmospheric nitrogen by denitrifying bacterias. This process is known as denitrification.

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