Ozone depletion in the stratosphere is mainly caused by
SO2
NO2
NO
Chlorofluorocarbons
Global warming may result in
flood
cyclone
decrease in forest productivity
all of the above
Which of the following statement is wrong ?
Polar stratospheric clouds (PSCs) are clouds formed over Antarctica.
Acid rain dissolves heavy metals such as Cu, Pb, Hg and Al from soil, rocks and sediments.
H2SO4 is major contributor to acid rain. HNO3 ranks second and HCl third in this respect.
Fishes grow as well in warm as in cold water.
Persons working in cement plants and lime stone quarries are more prone to disease like
asthma
cancer
silicosis
pneumoconiosis
Main pollutant from automobile exhaust is
CO
CO2
hydrocarbons
Aerobic oxidation is caused by
aerobic bacteria in presence of excess of oxygen
aerobic bacteria in absence of oxygen
anaerobic bacteria in presence of oxygen
anaerobic bacteria in absence of oxygen
BHC and DDT act are
carcinogens
allergens
asthematic agents
all of these
Ultraviolet radiation is absorbed by
exosphere
ionosphere
mesosphere
stratosphere
Pollutants released from iron and steel industry are
CO2, NO2, H2S
CO, CO2, SO2
CO2, SO2, NO2
CO2, NO, SO2
Planting more and more trees helps to
reduce CO2 in the air
increase CO2 in the air
reduce O2 in the air
reduce CO2 and increase O2 in the air
