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Biology - General Knowledge Objective Questions

91

Acid rain is mainly caused due to increase in the levels of the gas(es) : 

A.

SO2 only

B.

CO2 only

C.

SO2, CO2

D.

NO2 and SO2

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Correct answer is : D
Explanation

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92

The flow of energy among various trophic levels of an ecosystem is : 

A.

Unidirectional

B.

Bidirectional

C.

Multidirectional

D.

Circular

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Correct answer is : A
Explanation

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93

Increase in atmospheric temperature due to CO2 is called :

A.

Pasteur effect

B.

Green-house effect

C.

Blackman effect

D.

Emerson effect

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Correct answer is : B
Explanation

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94

The protective-ozone layer is present in :

A.

Ionosphere

B.

Stratosphere

C.

Troposphere

D.

Lithosphere

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Correct answer is : B
Explanation

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95

Decomposition of organic matter is brought about by :

A.

Protozoa

B.

Plants

C.

Micro-organisms

D.

None of these

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Correct answer is : C
Explanation

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