It is rich in methanogens.

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(C) Methanogens are anaerobic bacteria that produce methane as a metabolic byproduct in anoxic conditions.These bacteria are commonly found in the rum

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Excreta of cattle

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(C) Methanogens are anaerobic bacteria that produce methane as a metabolic byproduct in anoxic conditions.These bacteria are commonly found in the rumen (a part of the stomach) of cattle and in their excreta (dung).In the context of biogas production,the excreta of cattle (cow dung) is used as a primary source of methanogens to initiate the anaerobic digestion process.Therefore,the excreta of cattle is rich in methanogens.

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$(i)$ Methane
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Statement $P$: Bacteria produce methane gas due to metabolic processes like anaerobic respiration.
Statement $Q$: Bacteria act on starchy materials.

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