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Solution
The correct option is B Ammonification, nitrogen fixation, nitrate reduction, nitrification
a) Ammonification - It is a process of decomposition of organic nitrogen (proteins, nitrogenous excretions, etc. ) of dead plants and animals into ammonia.
b) Nitrogen fixation - It is the process of conversion of nitrogen gas to ammonia.
c) Nitrate reduction - It is the process of conversion of nitrate into ammonia.
d) Nitrification - It is the process of conversion of ammonia to nitrate.
So the correct answer is 'Ammonification, nitrogen fixation, nitrate reduction, nitrification'.