Air, Water and Soil Pollution - 8th Std Science
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Human beings damage healthy environment by __________
_______ present in the earth’s crust are the sources of radioacticity in the atmosphere.
Non Radioactive minerals
Most of the environmental problems are related to the increasing _______
________ leads to global warming.
Sulphur burns with oxygen to give __________
The increase in the global mean temperature due to green house gases is called __________
Holes in the Ozone layer allow the harmful ______rays to reach the earth.
_________ reduces the amount of pure fresh water.
Damage to soil results in ________
__________ systems carry waste from homes, offices and industry into water.
Most heated water comes from industries and power plants that use water for their _________
dry air coolers
________ the treated water for gardening or cooling purpose.
________ of water is a process of removing pollutants before it enters a water body.
The treated water has a very low level of _________
Plastics cause ___________ pollution
______ is polluted by garbage.
_________ destroy the insects.
________ hold soil in place.
River and Oceans
Trees and Plants
Real estate development can cause _______
__________ is biodegradable plastic
Poly Hydroxy Butyrate
The ______ and ______ micro organism are responsible for degradation.
The world’s worst industrial disaster occurred in Bhopal was caused by the leakage of ________ gas.
methyl iso thio cyanate
Methyl Iso Cyanate (MIC)
Chlorofluorocarbon causes _________
_________ poisoning causes minamata disease.
The three points we should remember and follow in our day today life are ________
Reduce, Recycle and Reuse
Respect, Love, Trust
Match the following.
- Burning of sulphur a. land pollution
- Combustion of fuels b. fertilizer
- Waste from farms c. Carbon monoxide
- Withering of soil d. Sulphur dioxide
- careless farming methods e. erosion
4 1 2 3 5
5 3 2 1 4
3 4 1 2 5
1 5 2 3 4
Match the following.
- homo polymer a. water body
- stream b. high uality fuel
- Compresses Natural Gas c. acid rain
- Nitrogen oxides d. pesticides
- DDT e. biodegradable plastic
4 5 1 3 2
2 3 4 5 1
1 3 2 5 4
3 2 1 4 5
- III. Choose the correct answer
The percentage of oxygen in air is
Carboxy haemoglobin is formed due to the air pollutant.
Which of the following gas is responsible for global warming.
The gas present in the stratosphere is
Land is mainly polluted by
The trade name of fully biodegradable plastic material naturally produced by micro organism is
Industrial emission / forest fire is a man made source of air pollution.
Nitrogen oxides / carbon dioxide case acid rain.
Sulphur dioxide causes lung cancer / global warming.
Oxides of Nitrogen dissolve in atmospheric water vapour forming nitric acid/ nitric oxide.
Ozone layer / acid rain causes corrosion of many buildings, bridges etc.
Holes in the ozone layer allow the harmful X-Rays/U-V Rays to reach the earth.
The pollutants that affect water come mainly from pond/ industries.
Addition of hot water to body of water is called water pollution/ thermal pollution
The process of waste water treatment is known as Sewage treatment/ Sewage system.
The use of excessive amount of fertilizer may decrease the pollution/ productivity of the soil.
Erosion/ Damage is the withering away of soil.
Fertilizers make crops grow more quickly, but can also clean / poison rivers and streams.
The release of carbon dioxide/ Chlorofluorocarbon from refrigerators has caused a breakdown in the ozone layer.
To save our earth from water crisis, we have to plant/cut down trees.
Planting more trees will increase the oxygen/ carbon dioxide content in the air.
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There are 49 questions to complete.