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What is the group of bacteria found in b...

What is the group of bacteria found in both the rumen of cattle and sludge of sewage treatment?

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Methanogens (Methanobacterium), anaerobically break down cellulosic material to produce `CO_(2)` and `H_(2)` and are found in
(i) Anaerobic sludge in sewage treatment plants.
(ii) Rumen (a part of stomach) to cattles, thus providing nutrition to cattles.
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NCERT EXEMPLAR-MICROBES IN HUMAN WELFARE -Microbes In Human Welfare
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  2. Given an example of a rod-shaped virus.

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