The correct answer is Methane.

• Biogas is consists of Methane, Hydrogen, Carbon dioxide.
• Methane is the Main Constituent of Gobar gas or Biogas.
• Biogas is a type of biofuel that is naturally produced from the decomposition of organic waste.
• When organic matter, such as food scraps and animal waste, breaks down in an anaerobic environment, they release a blend of gases, primarily methane and carbon dioxide.
  • Because this decomposition happens in an anaerobic environment, the process of producing biogas is also known as anaerobic digestion.
• Anaerobic digestion is a natural form of waste-to-energy that uses the process of fermentation to breakdown organic matter.
• Animal manure, food scraps, wastewater, and sewage are all examples of organic matter that can produce biogas by anaerobic digestion.
• Due to the high content of Methane in biogas ( 50-75%), biogas is flammable, and therefore produces a deep blue flame, and can be used as an energy source.
• Biogas also called an environmentally friendly energy source.