71.
If there was no $$CO_2$$ in the earth's atmosphere the temperature of earth's surface would be
A
higher than the present form environmental issues
B
less than the present
C
the same
D
dependent on the amount of oxygen in the atmosphere from environmental issues
Answer :
less than the present
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72.
The importance of ecosystem lies in
A
Flow of energy
B
Cycling of materials
C
A and B both
D
None of the above
Answer :
A and B both
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73.
The storage of energy of consumer level is known as
A
Grass primary production
B
Secondary productivity
C
Net primary productivity
D
Net productivity
Answer :
Secondary productivity
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74.
Which one of the following is not observed in biodiversity hotspots
A
Lesser inter-specific competition
B
Species richness
C
Endemism
D
Accelerated species loss
Answer :
Lesser inter-specific competition
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75.
Montreal protocol which calls for appropriate action to protect the ozone layer from human activities was passed in the year
A
1987
B
1988
C
1985
D
1986
Answer :
1987
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76.
How does carbon monoxide, a poisonous gas emitted by automobiles, prevent transport of oxygen into the body tissues?
A
By destroying the haemoglobin
B
By forming a stable compound with haemoglobin
C
By obstructing the reaction of oxygen with haemoglobin
D
By changing oxygen into carbon dioxide
Answer :
By forming a stable compound with haemoglobin
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77.
Air quality indicator is
A
Lichen
B
Moos
C
Algae
D
None of the above
Answer :
Lichen
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78.
Species diversity is maximum in
A
Tropical rain forest
B
Temperate forest
C
Deserts
D
Hill slops
Answer :
Tropical rain forest
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79.
Green house effect is warming due to
A
Infra-red rays reaching earth
B
Moisture layer in atmosphere
C
Increase in temperature due to increase in carbon dioxide concentration of atmosphere
D
Ozone layer of atmosphere
Answer :
Increase in temperature due to increase in carbon dioxide concentration of atmosphere
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80.
Minamata disease was caused due to the consumption of
A
Sea food containing lot of cadmium
B
Fist contaminated with mercury
C
Oysters with lot of pesticide
D
Sea food contaminated with selenium
Answer :
Fist contaminated with mercury
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