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Select the correct statement from the fo...

Select the correct statement from the following :

A

Biogas commonly called gobar gas, is pure methane

B

Activated sludge-sediment in settlement tanks of sewage treatment plant is a rich source of aerobic bacteria

C

Biogas is produced by the activity of aerobic bacteria on animal waste

D

Methanobacterium is an aerobic bacterium found in rumen of cattle

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to analyze each statement provided and determine which one is correct. Here’s a step-by-step breakdown: ### Step 1: Analyze the First Statement **Statement:** Biogas commonly called cobalt gas is pure methane. **Analysis:** This statement is incorrect. Biogas is commonly known as cow dung gas and is not pure methane. It consists of approximately 50-70% methane and 30-40% carbon dioxide, along with traces of other gases. ### Step 2: Analyze the Second Statement **Statement:** Activated sludge sediment in settlement tanks of sewage treatment plant is a rich source of aerobic bacteria. **Analysis:** This statement is correct. Activated sludge is indeed a process used in sewage treatment, and the sediments in settlement tanks are rich in aerobic bacteria, which play a crucial role in breaking down organic matter. ### Step 3: Analyze the Third Statement **Statement:** Biogas is produced by the activity of the aerobic bacteria on animal waste. **Analysis:** This statement is incorrect. Biogas is produced by the anaerobic breakdown of biomass, specifically by methanogenic bacteria, not aerobic bacteria. ### Step 4: Analyze the Fourth Statement **Statement:** Methanovacterium is an aerobic bacterium found in the rumen of cattle. **Analysis:** This statement is also incorrect. Methanovacterium is an anaerobic bacterium found in the rumen of cattle, which helps in the production of methane during digestion. ### Conclusion After analyzing all the statements, the only correct statement is the second one: **"Activated sludge sediment in settlement tanks of sewage treatment plant is a rich source of aerobic bacteria."** ### Final Answer The correct statement is: **Activated sludge sediment in settlement tanks of sewage treatment plant is a rich source of aerobic bacteria.** ---
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