Question

Biogas plant is more useful than burning of dung cakes because
A. It’s a non pollutant
B. It yields manure as well as fuel gas
C. It yields important biochemical
D. Both A and B

Answer 1

Based on calorie count we can find the correct answer and on knowing the basics of biogas its properties and its production. Microorganisms help in the production of biogas by performing anaerobic respiration.

Complete step by step solution:
Biogas is a mixture of gases. In the formation of biogas mixture there is absence of oxygen. They help convert waste in organic materials like agricultural waste, manure, municipal waste, sewage, green waste, food waste, etc. They produce both biogas and manure from the decomposition of waste material. This gas has a very higher calorific value than cow dung cakes. The calorific value of $CH{}_4$ or methane is $5.5KJ/g$ whereas its value of cow dung cakes is $3.1KJ/g$. Biogas do not produce any kind of pollutant like cow dung on burning produces carbon dioxide. Neither biogas noe cow dung cake leaves behind ash or soot on burning. Hence biogas is a non pollutant.

Hence the correct answer is option D.

Additional Information:
production of biogas takes place by breakdown of the organic matter anaerobically .i.e. in the absence of oxygen mainly consisting of methane and carbon dioxide. It is known to be a renewable source of energy.

Note: The organism methanogen which is an anaerobic organic helps to produce biogas with the help of anaerobic digestion, it digest the organic material in a closed system. This system is known as anaerobic digester, biodigester or bioreactor.