CBSE Class 10 Science 2019 · Paper 31/1/2/C · Question 9
What is biomass ? State the basic principle behind the working of a biogas plant. Name the main combustible component of biogas and also state its percentage.
Answer
Biomass is plant and animal matter used as fuel; biogas forms by anaerobic decomposition of biomass and is mainly methane (up to ).
Biomass: Plant and animal matter and their wastes, such as wood, crop residue, cattle dung and sewage, used as a source of fuel, is called biomass.
Principle of a biogas plant: A slurry of cow dung (biomass) and water is kept in a sealed digester without oxygen. Anaerobic micro-organisms decompose (break down) the complex compounds of the slurry and release biogas, a mixture of methane, carbon dioxide, hydrogen and hydrogen sulphide. This is anaerobic decomposition of biomass.
Main combustible component: Methane (), which makes up to of biogas.
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