Which among the following is the main constituent of biogas?

Correct answer: (d) Methane

Explanation

Biogas is produced by anaerobic digestion of animal and plant waste by microbes.

Its main constituent is Methane (CH4), making up about 50–70%, followed by carbon dioxide.

The methane makes biogas inflammable and usable as fuel; propane, butane and ethane are not its major components.