Question

Compare and contrast bio-mass and hydroelectricity as sources of energy.

Answer 1

Bio-mass and hydroelectricity:

Bio-mass	Hydroelectricity
1. Bio-mass causes air pollution.	1. Hydroelectricity does not cause pollution.
2. Bio-mass can be obtained from dead plants.	2. Hydroelectricity is obtained from the energy that is stored in water.
3. Biomass generates heat energy that can be used in the kitchen.	3. Hydroelectricity can run all types of electric appliances.
4. The devices used for utilizing bio-mass (challahs, biogas plants) can be installed at all places.	4. It requires the construction of dams on rivers and its plants can be built only in a few places.