Y Yatendra Sir 🎓 Tutor III ⭐ 5.66K Points Q. Biogas is formed in the (A) presence of air only (B) presence of water only (C) absence of air only (D) presence of water and absence of air 👁️ Show Answer 💬 Discuss 🔗 Share ✅ Correct Answer: (D) presence of water and absence of air