421.
What shall be the effect of destruction of wild life A
Wild gene of disease resistance will not be obtained
B
Soil erosion
C
Floods
D
Green house effect
Answer :
Wild gene of disease resistance will not be obtained
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422.
Earliest settlers on barren lands or the farmers of nature are A
Diatoms
B
Lichens
C
Moss & grasses
D
Ferns
Answer :
Lichens
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423.
If we completely remove decomposers from an ecosystem, the ecosystem functioning will an ecosystem, the ecosystem functioning will be adversely affected because A
Mineral movement will be blocked
B
Herbivores will not receive solar energy
C
Energy flow will be clocked
D
Rate of decomposition of other components will be vary high
Answer :
Mineral movement will be blocked
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424.
Soil erosion is greater when A
No rain occurs
B
Winds do not blow
C
The rainfall is evenly distributed
D
The rainfall is received in heavy down pour
Answer :
The rainfall is received in heavy down pour
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425.
Correct percentage of CO2 in atmosphere is A
0.03%
B
0.3%
C
1%
D
1.1%
Answer :
0.03%
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426.
Green plants is a forest ecosystem are A
Suppliers of food & O2
B
Consumers of nutritive materials
C
Consumers of animal proteins
D
Suppliers of timber
Answer :
Suppliers of food & O2
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427.
Rhododendron in characteristic vegetation of A
Tropical region
B
Mangrove
C
Alpine region
D
Epiphytes
Answer :
Alpine region
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428.
Water logged soils are A
Physiologically dry
B
Physiologically wet
C
With great amount of water
D
With less amount of water
Answer :
Physiologically dry
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429.
Process of soil conservation involves A
Addition of fertilisers
B
Aeration of soil
C
Protection of soil against loss
D
Soil erosion
Answer :
Protection of soil against loss
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430.
Concentration of DDT is highest in A
Primary consumer
B
Producers
C
Top consumer
D
Decomposers
Answer :
Top consumer
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