(a)
Interpretation:
The two ideas that might help us keep water clean have to be provided.
Concept introduction:
Water pollution: It can be defined as alternation in physical, chemical and biological characteristics of water through natural or human activities and making it unsuitable for its designated use.
Fresh water present on the earth surface is put to many uses, it used for drinking, domestic and municipal use agricultural, irrigation, and navigation. The used water becomes contaminated and is called as waste water.
(b)
Interpretation:
- The importance of global water issue has to be identified.
- The two factors that make the global water issue as important have to be suggested.
- The two ways in which people currently are addressing this issue have to be named.
Concept introduction:
Water pollution: It can be defined as alternation in physical, chemical and biological characteristics of water through natural or human activities and making it unsuitable for its designated use.
Water treatment: when effluent discharged into a river body such as lake, river or sea a number of process occur like physical, chemical and biological characteristics of water change which causes loss of organism.
The extent of damage depend upon type of pollutant present in effluent, non-bio degradable pollutant like mercury are most deadly as they accumulate in aquatic organism which lead to bio magnifications.
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