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181.

BOD stands for:

A.	Biotic oxygen deduction	B.	Base of degradation
C.	Biotic oxide demand	D.	Biological oxygen demand

182.

Various fungi are known to accumulate considerable quantities of divalent metal such as:

A.	Cadmium	B.	Zinc
C.	Lead	D.	All of the above

183.

Aerosols reduce primary productivity by:

A.	Decreasing O2	B.	Reducing photosynthesis
C.	Competing with CO2	D.	Being toxic to chlorophlasts

184.

In a river, if its BOD is high, then:

A.	River is polluted	B.	River is not polluted
C.	River is day	D.	None of these

185.

Which of the following does not cause pollution?

A.	CO2	B.	SO2
C.	H2	D.	CO

186.

Ozone hole is refers to as:

A.	Hole in ozone layer	B.	Decrease in the ozone layer in troposphere
C.	Decrease in thickness of ozone layer in stratosphere	D.	Increase in the thickness of ozone layer in troposphere

187.

Which of the following is most poisonous?

A.	CO	B.	CO2
C.	C	D.	SO2

188.

BOD is the amount of oxygen:

A.	Present in water	B.	Utilized by organisms in water
C.	Utilized by micro-organisms for decomposition	D.	Demanded by the producers for the production of food

189.

Which is a degradable pollutant?

A.	DDT	B.	Aluminium foil
C.	Domestic wastes	D.	Mercury slats

190.

BOD is connected with:

A.	Organic matter	B.	Microbes
C.	Both (a) & (b)	D.	None of these