1.

Compare and contrast biomass and hydroelectricity as sourcesof energy .

Answer»

Solution :(i) Biomass is a renewable SOURCE of energy only if we plant trees in a planned manner which not the CASE with hydroelectricity .
(ii) The energy form bio - mass can be OBTAINED by using a chulha or a gobar gas plant whereas hydroelectricity requires CONSTRUCTION of DAMS on rivers.
(iii) Biomass provides pollution - free energy only when converted into bio - gas whereas hydroelectricity is totally pollution - free.


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