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