बायोगैस का मुख्य घटक कौन सा है?

उत्तर: (B) मीथेन — Methane (CH₄) is the main component of biogas (~60-70%). CO₂ is ~30-40%. Biogas is produced by anaerobic decomposition of organic waste (cow dung, plant matter). It's a renewable energy source used fo...