Water pollution
Water Pollution
D1.Name any two materials which can make rain water impure.
Ans:Dust and smoke are the two materials which pollute the rain water
D2.Name two human activities which can cause water pollution?
Ans: Washing clothes and bathing in river or pond pollute the water.
D3.Which two pollutants are often dumped by factories into the river?
Ans: Harmful chemical and solid waste materials are dumped into the river by the factories.
D4.Name any two diseases that can be caused by drinking polluted water.
Ans: Two diseases that may causes by drinking polluted water are jaundice and cholera.
D5.Write the names of two types material, used by farmers to increase the production of crops.
Ans: Pesticides and chemical fertilizer are the two types of material used by farmer to increase the crop production.
E1.How do wastes from factories and fields affect the aquatic animals?
Ans: Agricultural and industrial waste increase the number of micro-organisms in water ,which increase the BOD(Biological Oxygen Demand).Aquatic animal and plant do not get sufficient oxygen and finally die.
E2.How can polluted water affect the crops?
Ans: When polluted water is used in crop field it reduces the soil fertility which leads to low crop production.
E3.Why is oil spill harmful for marine life?
Ans: Oil spill from ships create a layer on the surface of water which cut –off the oxygen supply for marine life. Without oxygen marine life find difficult to survive. So oil spill is harmful for marine life.
E4.State any four effects of water pollutions.
Ans:Effects of water pollutions are:
1)Poisonous chemicals fromfactories kills marineanimals.
Human being suffer from many water borndiseasesby drinking polluted water.
Oil spillscut-off the oxygen suply for marine animals and make their life difficult to survive.
Polluted water reduces the fertility of the soil.
E5.State four ways of reducing water pollution.
Ans:The ways of reducing water pollutions are:
1.Do not allowe the factory waste directly intoriver.Treat the waste ,reduces the toxicity and then release the treatedwatertosomewhere.
2.people should not wash clothes or use soapsif they bath in rivers.
3.the use of chemical fertiliser shouldbe minimised.
4.Water from drains or sewage should not be allowed to enter into wells or river.
D1.Name any two materials which can make rain water impure.
Ans:Dust and smoke are the two materials which pollute the rain water
D2.Name two human activities which can cause water pollution?
Ans: Washing clothes and bathing in river or pond pollute the water.
D3.Which two pollutants are often dumped by factories into the river?
Ans: Harmful chemical and solid waste materials are dumped into the river by the factories.
D4.Name any two diseases that can be caused by drinking polluted water.
Ans: Two diseases that may causes by drinking polluted water are jaundice and cholera.
D5.Write the names of two types material, used by farmers to increase the production of crops.
Ans: Pesticides and chemical fertilizer are the two types of material used by farmer to increase the crop production.
E1.How do wastes from factories and fields affect the aquatic animals?
Ans: Agricultural and industrial waste increase the number of micro-organisms in water ,which increase the BOD(Biological Oxygen Demand).Aquatic animal and plant do not get sufficient oxygen and finally die.
E2.How can polluted water affect the crops?
Ans: When polluted water is used in crop field it reduces the soil fertility which leads to low crop production.
E3.Why is oil spill harmful for marine life?
Ans: Oil spill from ships create a layer on the surface of water which cut –off the oxygen supply for marine life. Without oxygen marine life find difficult to survive. So oil spill is harmful for marine life.
E4.State any four effects of water pollutions.
Ans:Effects of water pollutions are:
1)Poisonous chemicals fromfactories kills marineanimals.
Human being suffer from many water borndiseasesby drinking polluted water.
Oil spillscut-off the oxygen suply for marine animals and make their life difficult to survive.
Polluted water reduces the fertility of the soil.
E5.State four ways of reducing water pollution.
Ans:The ways of reducing water pollutions are:
1.Do not allowe the factory waste directly intoriver.Treat the waste ,reduces the toxicity and then release the treatedwatertosomewhere.
2.people should not wash clothes or use soapsif they bath in rivers.
3.the use of chemical fertiliser shouldbe minimised.
4.Water from drains or sewage should not be allowed to enter into wells or river.
Very good answers prasanna sir
ReplyDeleteThankyou sir
ReplyDeleteIt is very important for us
ReplyDeleteGood answer
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