W
ater is indispensable for the survival of all living beings . All living beings contain water as an important fragment of the total body weight .If the body of living beings does not get water , the cells start dying due to dehydration . This leads to the death of the organism.
we use water for various purposes such as cooking , drinking , washing , bathing ,cleaning irrigation , generating electricity etc. We need water to run industries and factories as well . Water is essential in most of our agricultural activities .Therefore , water is very useful to us .
The water from all the sources may not be safe for our household use .Even the natural sources of water may contain living and non living impurities . Bacteria , algae , round worm , water fleas , tiny insects , eggs of mosquito etc are the living impurities while dust , soil , dissolved salts ,metal ions etc are the non living impurities present in water . Water is mainly made impure by the human activities . Throwing human and animal excreta and other waste materials in the water sources pollution the water. The dirtiness of water due to addition of unwanted and harmful materials into it is known as water pollution.
CAUSES OF WATER POLLUTION
Water can be polluted in the following ways :
1.Mixing of sewage and garbage into the source of water
2.Decay of dead plant parts and dead animals in the source of water
3.Using pesticides and chemical fertilizers in the fields .These chemicals are washed away by moving water and are mixed with low lying water sources.
4.Washing clothes , cleaning utensils and having bath at the sources of water.
5.Letting domestic animals drink water and have bath at the sources of water.
6.Mixing of industrial effluents and other wastes with sources of water.
MODE OF TRASMISSION OF WATER BORNE DISEASES
The germs are released in water through excerta and urine of the sick people .Decay of dead bodies ,washing ,bathing etc can also introduce germs into the water.If such polluted water is drunk by the healthy people the germs reach their body and multiply in numbers .When a large number of germs attack the body of people ,they fall sick.
Generally , the water from river , lake , pond , well etc is not free from pollution. Even if it looks clean , it may contain some dissolved impurities and invisible bacteria , virus etc. If such water is drunk directly ,it makes people sick.
1 comments: until now.
Yes, it is good to name the seemingly obvious; we ARE water beings. Thanks for posting. The Water image in this blog is properly mesmerizing/gorgeous (and what brought me here!)
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