Question

Assertion (A): Cattle dung can be used for the generation of biogas
Reason (R): Dung of cattle is a rich source of methanogens which belong to the domain Bacteria

• A. Both assertion and reason are true and the reason is the correct explanation for the assertion
• B. Both assertion and reason are true but the reason is not the correct explanation for the assertion
• C. Assertion is true but reason is false
• D. Both assertion and reason are false

Answer 1

The correct option is C Assertion is true but reason is false

Biogas is a combustible gas which predominantly consists of methane and carbon dioxide. It is widely used as an eco-friendly and pollution free fuel for cooking and lighting in rural areas.

Biogas is produced due to the anaerobic breakdown of organic wastes by methanogenic bacteria.

Methanogenic bacteria are included in the domain Archaea as per the six-kingdom system of classification.

The most commonly used raw materials for biogas production are - slurry of cow dung (as it is a rich source of methanogens) and water, agricultural wastes, night soil (human excreta collected in buckets at night). As these materials are more readily available in rural areas, biogas plants are mostly situated in rural areas.

Hence, assertion is true but reason is false.