19227.The two gases making highest relative contribution to the greenhouse gases are
CO2 and N2O
CO2 and CH4
CH4 and N2O
CFC5 and N2O
19229.Which one of the following is not a bioindicator of water pollution?
Blood-worms
Sludge-worms
Sewage fungus
Stone flies
19231.Common indicator organism of water pollution is:
Entamoeba histolytica
Escherichia coli
Eichhornia crassipes
Lemna paucicostata
19232.Gas leaked during Bhopal tragedy was
Ethyl isothiocyanate
Sodium isothiocyanate
Potassium isothiocyanate
Methyl isocyanate
19233.Global agreement in specific control strategies to reduce the release of ozone depleting substances, was adopted by
The Vienna Convention
Rio de Janeiro Conference
The Montreal Protocol
The Koyoto Protocol
19235.Lichens can be used as :
Source of wood
Initial vegetation for waste lands
Bio-indicator for water and air pollution
To check the air pollution
19236.Increase in the concentration of pollutants in higher trophic levels is known as
Biomagnification
Biodegradation
Eutrophication
Recycling
19238.lf there was no CO2 in the atmosphere, the earth's temperature would be
Less than the present
Same as present
Higher than the present
Dependent on O2 content of air
19239.Which of the following pollutants is discharged by jet planes?
Photo-chemical oxidants
Fog
Smog
Aerosols
19240.SO2 pollution is indicated by
Deschampsia (grasses)
Sphagnum (Mosses)
Usnea (Lichens)
Cucurbita (climbers)
19242.Major aerosol pollutant present in the jet plane emission is
Carbon monoxide
Carbon tetrachloride
Chlorofluorocarbon
Sulphur dioxide
19243.Which of the following shows biological amplification?
Hg
Cd
Both (A) and (B)
Neither (A) nor (B)
19244.Ultra-violet light causes
Photodynamic action
Sticky metaphases
Formation of pyrimidines
Destruction of hydrogen bonds between complementary DNA strands
19246.Escherichia coli used as an indicator organism to determine pollution of water with
Industrial effluents
Heavy metals
Pollen of aquatic plants
Faecal matter