Methanogenic bacteria are not found in

Rumen of cattle

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Gobar gas plant

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Bottom of water-logged paddy fields

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Activated sludge

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Solution

The correct option is C Activated sludge
Methanogenic bacteria (bacteria that produce methane) are not found in activated sludge. Methanogenic bacteria are anaerobic bacteria.
The microbes found in activated sludge are aerobic bacteria that grow rapidly and form flocs.
Hence, Methanogenic bacteria are not found in activated sludge.

So, the correct answer is option D.

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