A) two-step process
B) one step process
C) four step process
D) three step process
Correct Answer: D
Solution :
Biogas is produced by anaerobic digestion of organic matter. It is a three step process. In the first step, facultative anaerobic micro-organisms breakdown the polymers into soluble monomers through enzymatic hydrolysis. In the second step, the monomers become the substrate for micro-organisms. There are converted into organic acids. In the final step, methanogenic bacteria generate methane.
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