Answer:
(c) The raw material for biogas
production is excreta (dung) of cattle. The biogas plant consists of a concrete
tank (10-15 feet deep) in which bio-wastes are collected and slurry of dung is
fed.
A floating cover is placed over the
slurry, which keeps on rising as the gas is produced in the tank due to the
microbial activity. Methano bacterium in the dung act on the bio-wastes to
produce bio-gas. The gas produced is supplied to nearby houses by an outlet.
Through another outlet, the spent slurry is removed to be used as manure.
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