In a biogas plants, one of them will be essential.
A
Azolla
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B
Rhizobium
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C
Nitrifying bacteria
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D
Methanobacterium
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Solution
The correct option is DMethanobacterium Biogas is the alternate source of energy produced by the decomposition of organic wastes such as animal excreta and kitchen wastes by the action of methanobacterium. It contains nearly 70% methane. Methane is an inflammable fuel. $Methanobacterium$ is the bacterium that can synthesize methane. Hence, the methanogenic bacteria are of great use in biogas plants.