331.
Which gas contributes most to green house effect?
A
CFC
B
Freon
C
$$CO_2$$
D
$$CH_4$$
Answer :
$$CO_2$$
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332.
Which biome refers to arctic desert
A
Tundra
B
Taiga
C
Savannah
D
Thar desert
Answer :
Tundra
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333.
The UN conference of Parties on climate change in the year 2012 was held at:
A
Doha
B
Lima
C
Warsaw
D
Durban
Answer :
Doha
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334.
Which of the following is the use of lichens in case of pollution?
A
They treat the polluted water
B
They act as bioindicators of pollution
C
They promote pollution
D
Lichens are not related with pollution
Answer :
They act as bioindicators of pollution
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335.
Which is the reason for highest biomass in aquatic ecosystem
A
Nano plankton, blue green algae, green algae
B
Sea grass, and slime molds
C
Benthonic and brown algae
D
Diatoms
Answer :
Benthonic and brown algae
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336.
Factors relating to form and behaviour of the earth's surface are called
A
Edaphic
B
Topographic
C
Climate
D
Biotic
Answer :
Topographic
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337.
Photosynthetic Active Radiation (PAR) has the following range of wavelengths
A
340 - 450 nm
B
400-700nm
C
500 - 600 nm
D
450 - 950 nm
Answer :
400-700nm
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338.
Soil conservation is the process where
A
Soil is aerated
B
Soil erosion is allowed
C
Soil is protected against loss
D
Sterile soil is converted into fertile soil
Answer :
Soil is protected against loss
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339.
Good ozone is found in the
A
mesosphere
B
troposphere
C
stratosphere
D
ionosphere
Answer :
stratosphere
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340.
Biological Oxygen Demand (BOD) is a measure of
A
Industrial wastes poured into water bodies
B
Extent to which water is polluted with organic compounds
C
Amount of carbon monoxide inseparably combined with haemoglobin
D
Amount of oxygen needed by green plants during night
Answer :
Extent to which water is polluted with organic compounds
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