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Class 12 Biology
Environmental Issues Chapter 16
Quiz 1
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In a polluted environment, the concentration of pollutant would be maximum in
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Primary consumers
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Tertiary consumers
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Producers
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Secondary consumers
The pH of acid rain is below
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4.6
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6.5
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6
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7
A common indicator organism of water pollution is
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Lemna paucicostata
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Escherichia coli
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Entamoeba histolytica
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Eichhornia crassipes
Nutrient enrichment of water bodies causes
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Stratification
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Succession
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Eutrophication
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None of the above
Thermal pollution results in
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Death of aquatic animals
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All of the above
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Increase in the temperature of water bodies
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Depletion of O2
Photochemical smog is caused by a light-mediated reaction between
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SO2 and O3
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SO2 and unburnt hydrocarbons
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NO2 and O3
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NO2 and unsaturated hydrocarbons
The term biomagnification refers to the
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Growth of organisms due to food consumption
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Blowing up of environmental issues by man
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Increase in the concentration of non-degradable pollutants as they pass through the food chain
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Increase in population size
A lake with an inflow of domestic sewage rich in organic waste may result in
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An increased production of fish due to plenty of nutrients
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Increased population of aquatic food web organisms
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Death of fish due to lack of oxygen
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Drying of the lake very soon due to algal bloom
Which of the following is a secondary pollutant?
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NO
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SO2
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PAN
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NO2
The loudness of sound which a person can withstand without discomfort is about
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215 dB
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30 dB
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150 dB
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80 dB
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