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Methanogenic bacteria are not found in...

Methanogenic bacteria are not found in

A

rumen of cattle

B

gobar gas plant

C

bottom of water-logged paddy fields

D

activated sludge

Text Solution

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding Methanogenic Bacteria**: Methanogenic bacteria are a type of microorganisms that produce methane as a metabolic byproduct in anoxic (absence of oxygen) conditions. They are classified as anaerobic bacteria. 2. **Analyzing the Options**: - **Option A: Rumen of Cattle**: The rumen is an anaerobic environment where methanogenic bacteria thrive, as it is part of the digestive system of ruminants. - **Option B: Cow Dung Gas Plant**: These plants utilize anaerobic digestion, which is conducive for methanogenic bacteria to produce biogas (methane). - **Option C: Bottom of Waterlogged Paddy Field**: Waterlogged conditions create an anaerobic environment that supports methanogenic bacteria. - **Option D: Activated Sludge**: Activated sludge processes involve aeration, which introduces oxygen into the environment, making it unsuitable for anaerobic bacteria like methanogens. 3. **Identifying the Correct Answer**: Since methanogenic bacteria require anaerobic conditions to thrive, they will not be found in environments where oxygen is present. Therefore, the correct answer is **Option D: Activated Sludge**. ### Final Answer: Methanogenic bacteria are not found in **Activated Sludge**. ---

### Step-by-Step Solution: 1. **Understanding Methanogenic Bacteria**: Methanogenic bacteria are a type of microorganisms that produce methane as a metabolic byproduct in anoxic (absence of oxygen) conditions. They are classified as anaerobic bacteria. 2. **Analyzing the Options**: - **Option A: Rumen of Cattle**: The rumen is an anaerobic environment where methanogenic bacteria thrive, as it is part of the digestive system of ruminants. - **Option B: Cow Dung Gas Plant**: These plants utilize anaerobic digestion, which is conducive for methanogenic bacteria to produce biogas (methane). ...
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