Answer:
(c) An undesirable change in the physical,
biological or chemical qualities or water that adversely affects the aquatic
life and makes the water unfit for use. is called water pollution. Pollution of
water is one of the most serious environmental problems of the world.
Water pollution may be of following three types
(i) Surface water pollution (or inland water pollution)
(ii) Underground water pollution.
(iii) Marine water pollution.
The contaminants leading to pollution in water include a
wide spectrum of chemicals, pathogens and physical or sensory changes such as
elevated temperature and discoloration. Pathogens cause water borne diseases.
Alteration of physical and chemical, properties of water
including change in pH, electrical conductivity, temperature and eutrophication
(increase in concentration of chemical nutrients), also causes water pollution
change in pressure of water bodies do not causes water pollution.
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