Short Answer TypeA large number of fish are suddenly found floating dead on a lake. There is no evidence of toxic dumping but you find an abundance of phytoplankton. Suggest reason for the fish kill.
What would have happened if the greenhouse gases were totally missing in the earth's atmosphere ? Discuss.
What do you mean by green chemistry? How will it help decrease environmental pollution?
Or
Comment: 'Green chemistry is an alternative tool for reducing pollution'
Long Answer TypeHave you ever observed any water pollution in your area? What measures would you suggest to control it?
Short Answer TypeLong Answer TypeDo you observe any soil pollution in your neighbourhood? What efforts will you make for controlling the soil pollution?
we have observed soil pollution in nearby agricultural fields. This is due to the use of a lot of fertilisers are chemical substances which help the soil to become fertile. But an excess of fertilisers pass to the groundwater from the soil and as runoff to lakes rivers and seas and are harmful to aquatic animals.
The control of soil pollution can be made by using manure and biofertilizers instead of fertilisers:
Use of manure : manure is a semi-decayed organic matter which is added to the solid to maintain fertility. These are mostly prepared from animal dung and other farm refuse. These are much better than the commonly used fertilisers.
Use of biofertilizers: These organisms are inoculated in water to bring nutrient enrichment of the solid, e.g., nitrogen-fixing bacteria and blue-green algae.
Multiple Choice QuestionsOzone is present as a chief constituent in which region of the atmosphere?
Troposphere
Stratosphere
Mesosphere
Thermosphere
The gas leaked from a storage tank of the Union Carbide plant in Bhopal tragedy was
Methyl isocyanate
Methylamine
Ammonia
Ammonia
A water sample has ppm level concentration of following anions
F-= 10; SO42- =100; NO3-= 50
the anion/anions that make/makes the water sample unsuitable for drinking is /are:
only NO3-
both 2 SO4- and NO3-
only F–
only F–
Identify the wrong statements in the following:
Chlorofluorocarbons are responsible for ozone layer depletion
Greenhouse effect is responsible for global warming
Ozone layer does not permit infrared radiation from the sun to reach the earth
Ozone layer does not permit infrared radiation from the sun to reach the earth
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