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प्रश्न
The term “water-pollution” can be defined in several ways. Which of the following statements does not give the correct definition?
विकल्प
The addition of undesirable substances to water-bodies
The removal of desirable substances from water-bodies
A change in pressure of the water bodies
A change in temperature of the water bodies
उत्तर
A change in pressure of the water bodies
Explanation:
Water pollution can be defined as an undesirable change in the physical, biological or chemical qualities of water that adversely affects aquatic life and makes water unfit for use. Water pollution is caused due to addition of undesirable substances (pollutants) to the water bodies. Polluted water may be devoid of certain desirable substances like oxygen, essential nutrients, optimum pH etc. Thermal pollution, i.e., changes in the temperature of water bodies can adversely affect aquatic organisms and cause their death.
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