BHC and DDT act as
carcinogens
allergens
asthematic agents
all of these
A person dies in atmospheric of CO because it
combines with oxygen present in the body
destroys W.B.C
reduces water in the tissues.
combines with haemoglobin of blood and form stable compound carboxyhaemoglobin and reduces the oxygen carrier capecity of blood .
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
Main pollutant from automobile exhaust is
CO
CO2
NO
Hydrocarbons
Ultraviolet radiation is absorbed by
exosphere
ionosphere
mesosphere
stratosphere
Lead population is mainly caused by
sewage
insecticide
leaded gasoline
None of these
Which of the following pollutants is not emitted during volcanic eruptions ?
SO2
H2S
Ozone in stratosphere is depleted by
C6F6
C6H6Cl6
CF2Cl2
C7F16
Ozone hole is maximum over
India
Pakistan
Australia
Antarctica
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
