Choose the incorrect statement (a) We are encouraged to plant more trees so as to ensure a clean environment and also provide bio-mass fuel (b) Gobar-gas is produced when crops, vegetable wastes etc., decompose in the absence of oxygen (c) The main ingredient of bio-gas is ethane and it gives a lot of smoke and also produces a lot of residual ash (d) Biomass is a renewable source of energy

Answer: (c) The main ingredient of bio-gas is ethane and it gives a lot of smoke and also produces a lot of residual ash

The main product of biogas is methane. It burns with less smoke and did not produce residual ash.

Biogas

Biogas refers to a mixture of gases produced by the anaerobic decomposition of organic matter such as agricultural waste, municipal waste, plant residue, food waste etc. Biogas consists of methane, carbon dioxide along with a small amount of hydrogen sulphide, and moisture.

Steps involved in the production of biogas

There are three major steps involved in biogas production

  1. Hydrolysis: Large organic molecules such as proteins, carbohydrates and lipids are allowed to break down into simpler units with the help of certain enzymes.
  2. Fermentation:Here in this step the fermentation of organic products takes place and yield many products like organic acids, alcohols, amino acids, CO2 whixh can be used in the next level
  3. Methane formation: Methane gas is produced
  4. The residue will be left after the formation of biogas.

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