Which of the following two are the main constituents of biogas? 1. Methane 2. Butane 3. Carbon dioxide 4. Carbon monoxide Select the correct answer using the code given below.

ಉತ್ತರ ತೋರಿಸು ಮತ್ತು ವಿವರಣೆ

ಉತ್ತರ: (C) 1 and 3

ವಿವರಣೆ

Biogas is mostly methane (50-75%) and carbon dioxide (25-50%).