Water is most imp for our survival.Plants need water for their growth.

1.	Water is most imp for our survival.Plants need water for their growth. We need water for drinking, taking bath,etc,. But water in the lake,river,etc. Is not clean for all purposes.ocean though convert about 70% of the earth surface but being salty is unfit for human consumption. In a number of ways, we are responsible for causing water pollution good citizen; we should stop doing things leading to water pollution. (i) Our religion suggests taking bath in Gangs or even Drinking it.What are your views as a student of science? What do you suggest should be done? (ii) How sometimes sea water gets polluted to the extent that aquatic life including fisg die? (iii) How does the use of fertilizer affect the aquatic life in the lake and other water bodies? (iv) Why 1ppm of fluride is added to drinking water?What will happen if concentration is higher? (v) Why lead pipes should not be used for transport of water? (vi) What is the safest pH range for drinking water?
Answer» (i) The water that of river including that of ganga is getting polluted Due to industrial discharges from paper,textile,and many other industries and also due to Domestic Sewage discharge by people living on the bank of this river.The use of water from these river can cause water borne diseases like Jaundice,Cholera,etc. (ii) Pollution in sea water by oil spill due to accident of ship carrying oil or leakage of pipe line or deliberately done as a golf war covers the surface of sea water by a layer of oil .As a result ,aquatic life perishes. (iii) During rain excess fertilizer present on the soil are washed away into lakes and rivers. These fertilizers accelerate the growth of algae. This covers the water surface. Hence, concentration of dissolved oxygen decreases.Further,when short lived algae die or the excessive phytoplankt on present in the water start decomposing, the decomposing bacteria consume dissolved oxygen.Thus,the amount of dissolved oxygen in water Decreases and the fish starts dying. (iv) Fluorida protects teeth against decay. Concentration above 2 ppm causes brown mottling of teeth. (v) Lead poisoning occurs which damages Kidney, Liver,Brain and Reproductive system. (vi) 5.5-9.5

Water is most imp for our survival.Plants need water for their growth. We need water for drinking, taking bath,etc,. But water in the lake,river,etc. Is not clean for all purposes.ocean though convert about 70% of the earth surface but being salty is unfit for human consumption. In a number of ways, we are responsible for causing water pollution good citizen; we should stop doing things leading to water pollution. (i) Our religion suggests taking bath in Gangs or even Drinking it.What are your views as a student of science? What do you suggest should be done? (ii) How sometimes sea water gets polluted to the extent that aquatic life including fisg die? (iii) How does the use of fertilizer affect the aquatic life in the lake and other water bodies? (iv) Why 1ppm of fluride is added to drinking water?What will happen if concentration is higher? (v) Why lead pipes should not be used for transport of water? (vi) What is the safest pH range for drinking water?

Answer»

(i) The water that of river including that of ganga is getting polluted Due to industrial discharges from paper,textile,and many other industries and also due to Domestic Sewage discharge by people living on the bank of this river.The use of water from these river can cause water borne diseases like Jaundice,Cholera,etc.

(ii) Pollution in sea water by oil spill due to accident of ship carrying oil or leakage of pipe line or deliberately done as a golf war covers the surface of sea water by a layer of oil .As a result ,aquatic life perishes.

(iii) During rain excess fertilizer present on the soil are washed away into lakes and rivers. These fertilizers accelerate the growth of algae. This covers the water surface. Hence, concentration of dissolved oxygen decreases.Further,when short lived algae die or the excessive phytoplankt on present in the water start decomposing, the decomposing bacteria consume dissolved oxygen.Thus,the amount of dissolved oxygen in water Decreases and the fish starts dying.

(iv) Fluorida protects teeth against decay. Concentration above 2 ppm causes brown mottling of teeth.

(v) Lead poisoning occurs which damages Kidney, Liver,Brain and Reproductive system.

(vi) 5.5-9.5

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