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71.

In the polluted water, the values of:

A.	BOD much higher than COD	B.	BOD slightly higher than COD
C.	COD slightly higher than BOD	D.	COD much higher than BOD

72.

COD stands for:

A.	Caesium oxide deposition	B.	Control of diesel
C.	Chemistry of depositions	D.	Chemical oxygen demand

73.

The Escherichia cells in a human excreta number in:

A.	Thousands	B.	Hundreds
C.	Billion	D.	Millions

74.

Prolonged liberal irrigation of agricultural fields is likely to create the problem of:

A.	Acidity	B.	Metal toxicity
C.	Aridity	D.	Salinity

75.

Pollution is:

A.	Always an unfavourble alteration	B.	Always a favourable change
C.	Rarely a favoruable alteration	D.	Usually an unfavourable change

76.

Which of the following is generally used for induced mutagenesis in crop plants?

A.	Gamma rays (from cobalt 60)	B.	X-rays
C.	UV (260 nm)	D.	Alpha particles

77.

The percentage of water found in oceans is:

A.	89%	B.	93%
C.	97%	D.	86%

78.

Greenhouse effect refers to:

A.	Production of cereals	B.	Trapping of UV rays
C.	Cooling of earth	D.	Warming of earth

79.

PAN stands for:

A.	Peroxy acetyl nitrate	B.	Peroxy acyl nitrite
C.	Pyridine aceto-nitrite	D.	Peroxy aceto-nitrile

80.

The sea water gets pollution mainly due to:

A.	Industrial waste	B.	Oil spills
C.	Death of marine fauna	D.	None of these