21.
Largest ecosystem of the world are
A
Forests
B
Grass lands
C
Great lakes
D
Oceans
Answer :
Oceans
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22.
Which one of the following statements is wrong in case of Bhopal tragedy?
A
Methyl lsocyanate gas leakage took place
B
Thousands of human beings died
C
Radioactive fall out engulfed Bhopal
D
It took place in the night of December 2/3 1984
Answer :
Radioactive fall out engulfed Bhopal
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23.
Mr. X in eating curd/yoghurt. For this food intake in a food chain he should be considered as occupying
A
First trophic level
B
Seconds trophic level
C
Third trophic level
D
Fourth trophic level
Answer :
Third trophic level
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24.
Which is best for plant growth
A
Loamy soil
B
Silt
C
Sandy soil
D
Clay soil
Answer :
Loamy soil
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25.
Plants grow in saline water are known as
A
Lithophytes
B
Halophytes
C
Mesophytes
D
Xerophytes
Answer :
Halophytes
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26.
Blood haemoglobin has high affinity for
A
CO2
B
CO
C
O2
D
H
Answer :
CO
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27.
Eutrophication is often seen in
A
deserts
B
fresh water lakes
C
ocean
D
mountains
Answer :
fresh water lakes
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28.
Montreal Protocol which calls for appropriate action to protect the ozone layer from human activities was passed in the year
A
1988
B
1985
C
1986
D
1987
Answer :
1987
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29.
Which one of the following pairs mismatched
A
Savanna - acacia trees
B
Coniferous forest - evergreen trees
C
Tundra - permafrost
D
Prairies-epiphytes
Answer :
Prairies-epiphytes
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30.
Which of the following bacteria has potential for nitrogen fixation
A
Nitrosomonas
B
Nitrobacter
C
Nitrosococcus
D
Rhizobium
Answer :
Rhizobium
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