21.
Which one of the following is a primary consumer in maize field ecosystem?
A
Lion
B
Grasshopper
C
Wolf
D
Phytoplankton
Answer :
Grasshopper
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22.
Whenman eats fish which feeds on zooplankton which have eaten small plants, the producer in the chain is
A
Zooplankton
B
Small plants
C
Fish
D
Man
Answer :
Small plants
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23.
Which of the following ecosystems has highest rate of gross primary production?
A
Grasslands
B
Mangroves
C
Coral reefs
D
Equatorial rain forest
Answer :
Equatorial rain forest
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24.
Which one of the following statements for pyramid of energy is incorrect, whereas the remaining three are correct ?
A
Its base is broad
B
It shows energy content of different trophic level organisms
C
It is inverted in shape
D
It is upright in shape
Answer :
It is inverted in shape
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25.
Vertical distribution of different species occupying different levels in a biotic community is known as:
A
Stratification
B
Zonation
C
Pyramid
D
Divergence
Answer :
Stratification
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26.
In a food chain, the largest population is that of
A
producers
B
decomposers
C
secondary consumers
D
primary consumers
Answer :
primary consumers
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27.
About 70% of total global carbon is found in
A
grasslands
B
agroecosystems
C
oceans
D
forests
Answer :
oceans
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28.
Decomposers are organisms that
A
elaborate chemical substances, causing death of tissues
B
operate in living body and simplifying organic substances of cells step by step
C
attack and kill plants as well as animals
D
operate in relay terms, simplifying step by step the organic constituents of dead body
Answer :
operate in relay terms, simplifying step by step the organic constituents of dead body
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29.
Which ecosystem has the maximum biomass?
A
Grassland ecosystem
B
Pond ecosystem
C
Lake ecosystem
D
Forest ecosystem
Answer :
Forest ecosystem
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30.
Secondary Succession takes place on/in :
A
Degraded forest
B
Newly created pond
C
Newly cooled lava
D
Bare rock
Answer :
Degraded forest
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