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141.

The term smong coined by:

A.	Tansley	B.	Odum
C.	Clements	D.	Des Voeux

142.

The classical smog was first observed to:

A.	Paris	B.	London
C.	Tokyo	D.	New York

143.

A disease caused by eating fish contained by industrial waste having mercury compounds is known as:

A.	Minimata disease	B.	Osteosclerosis
C.	Bright's disease	D.	Hashimoto disease

144.

If there were no CO2 in the earth's atmosphere, the temperature of earth's surface would have been:

A.	same as present	B.	Less than the present
C.	Higher than the present	D.	Dependent on the amount of O2 in the atmosphere

145.

In big cities, air pollution is mainly due to:

A.	Burning of fossil fuel	B.	Thermal power plants
C.	Sewage	D.	Suspended particles

146.

As compared to tap water the BOD of sewage polluted water shall be:

A.	High	B.	Low
C.	Same	D.	None of these

147.

The major drawback of DDT as a pesticide is that:

A.	Its cost of production is high	B.	It is not rapidly degraded in nature
C.	Organisms at once developed resistance to it	D.	It is significantly less effective than other pesticides

148.

Every pesticide develops its own failure as its repeated use leads to:

A.	The development of resistant pest varieties	B.	Simplification of food web
C.	Reduction in population of useful birds	D.	Increase in weed population

149.

How CO emitted by automobiles prevents transport of O2 in the body tissues?

A.	By changing O2 into CO	B.	By destroying the haemoglobin
C.	By forming a stable compound with haemoglobin	D.	By obstructing the reaction of O2 with haemoglobin

150.

Sewage drained into water bodies kills fishes because:

A.	It gives off a bad small	B.	It removes the food eaten by fishes
C.	It increases the competition with fishes for dissolved oxygen	D.	Excessive CO2 is added to water