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?
Water pollution arises as a result of various human activities. This includes discharges from wastewater treatment plants, runoff from agricultural fields, storm-water drainage, etc. Pollutants from these sources enter the water bodies, thereby contaminating the water and rendering it impure. Industries and chemical factories discharge toxic, heavy metals as Fe,Mn,Al, etc,. along with organic wastes into water. Domestic sewage and animal excreta are also responsible for pathogenic contamination of water.These pollutants make water unfit for drinking. therefore, all industrial and chemical discharges should be made free from toxic metals before allowing them to enter a water body.The concentration of these pollutants should be checked regularly. Compost should be preferred over chemical fertilisers in gardens and agricultural fields to avoid harmful chemicals from entering ground water.
Short Answer TypeLong Answer TypeDo you observe any soil pollution in your neighbourhood? What efforts will you make for controlling the soil pollution?
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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