A) Methanogens
B) Nitrifying bacteria
C) Ammonifying bacteria
D) Denitrifying bacteria
Correct Answer: A
Solution :
Biogas production involves three steps- (a) Breakdown of polymers. (b) Conversion of monomers into organic acids by fermentation microbes. (c) Generation of methane by methanogenic bacteria (conversion of organic acids into \[C{{H}_{4}}\] and \[C{{O}_{2}}\]).
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