Multiple choice

Bio-gas is produced from�

  1. Animal dung

  2. Human excreta

  3. Crop residues

  4. All of these

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Biogas production is a versatile anaerobic process that can utilize various organic feedstocks. Animal dung, human excreta, and crop residues all contain organic matter that bacteria can break down to produce methane-rich biogas.