Nitrogen fixation means:
1. releasing nitrogen from dead and decaying materials.
2. conversion of nitrite to nitrate.
3. conversion of nitrate to nitrite.
4. conversion of nitrogen gas into ammonia.

Subtopic:  Nitrogen Metabolism |
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Conversion of ammonium to nitrate during nitrogen cycle is called as:
1. Nitrogen assimilation
2. Denitrification
3. Nitrification
4. Nitratification

Subtopic:  Nitrogen Metabolism |
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A microbially facilitated process of dissimilatory nitrate reduction that may ultimately produce molecular nitrogen (N2) through a series of intermediate gaseous nitrogen oxide products is called as:

1. Nitrogen assimilation 2. Denitrification
3. Nitrification 4. Nitratification
Subtopic:  Nitrogen Metabolism |
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