Decomposition of animal and plant waste in the absence of air produces:
A
gas carbon
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B
coal gas
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C
biogas
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D
marsh gas
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Solution
The correct option is C biogas
Coal gas is produced from the dry distillation of coal and marsh gas is produced by gaseous decomposition product of organic matter, consisting primarily of methane.
But biogas contains marsh gas or methane with CO2 by anaerobic digestion. Anaerobic digestion is a collection of processes by which microorganisms break down biodegradable material in the absence of oxygen. The process is used for industrial or domestic purposes to manage waste, manure which is animal faeces and urine, wasted feed, bedding, and anti-slip material and/or to produce fuels.