31.
Sewage water can be purified by
A
Aquatic plant
B
Micro organism
C
Penicillin
D
Fishes
Answer :
Micro organism
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32.
The molecular action of ultraviolet light is mainly reflected through
A
Destruction of hydrogen bonds in DNA
B
Phtodynamic action
C
Formation of pyramidine
D
Formation of sticky metaphase
Answer :
Destruction of hydrogen bonds in DNA
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33.
The Air Prevention and Control of Pollution Act came into force in :
A
1981
B
1985
C
1990
D
1975
Answer :
1981
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34.
Global warming can be controlled by:
A
Reducing reforestation, increasing the use of fossil fuel
B
Increasing deforestation, slowing down the growth of human population
C
Increasing deforestation, reducing efficiency of energy usage
D
Reducing deforestation, cutting down use of fossil fuel
Answer :
Reducing deforestation, cutting down use of fossil fuel
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35.
In plant succession last community is called
A
Ecotone
B
Climaxcommunity
C
Seral community
D
Ecosystem
Answer :
Climaxcommunity
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36.
Energy enters in a food chain through
A
Producers
B
Primary consumers
C
Secondary consumers
D
Tertiary consumers
Answer :
Producers
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37.
Which one of the following statements is not valid for aerosols?
A
They alter rainfall and monsoon patterns
B
They cause increased agricultural productivity
C
They have negative impact on agricultural land
D
They are harmful to human health
Answer :
They cause increased agricultural productivity
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38.
The maximum energy is stored at following tropical level in any ecosystem
A
Producers
B
Herbevores
C
Carnivores
D
Top carnivores
Answer :
Producers
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39.
Rachel Carson's famous book "Silent Spring" is related to :
A
Noise pollution
B
Population explosion
C
Ecosystem management
D
Pesticide pollution
Answer :
Pesticide pollution
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40.
A major component of gobar gas is
A
Ammonia
B
Methane
C
Ethane
D
Butane
Answer :
Methane
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