261.
Which one is associated with occupational hazard is
A
Fluorosis
B
Pneumoconiosis
C
Silicosis
D
Asthama
Answer :
Pneumoconiosis
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262.
The plant parts when fully decomposed by microorganism & mixed in the soil is called
A
Litter
B
Duff
C
Mull
D
All of the above
Answer :
Mull
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263.
Maximum green house gas released by which country
A
India
B
France
C
U.S.A.
D
Britain
Answer :
U.S.A.
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264.
Ecosystem is
A
Any functional unit that includes the whole community in a given area interacting with the abiotic factors
B
A group of green plants
C
A group of animals interacting with environment
D
Man and pets living together
Answer :
Any functional unit that includes the whole community in a given area interacting with the abiotic factors
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265.
When biosphere turns into human dominated environment it is called
A
Noosphere
B
Troposphere
C
Mesosphere
D
Man sphere
Answer :
Noosphere
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266.
Which of the following is expected to have the highest value (gm/m2/yr) in a grassland ecosystem
A
Tertiary production
B
Gross production (GP)
C
Net production (NP)
D
Secondary production
Answer :
Gross production (GP)
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267.
Savannahs are
A
Tropical rain forest
B
Desert
C
Grassland with scattered trees
D
Dense forest with close canopy
Answer :
Grassland with scattered trees
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268.
Legume plants are important for atmosphere because they
A
Help in NO2 fixation
B
Do not help in NO2 fixation
C
Increase soil fertility
D
All of the above
Answer :
Help in NO2 fixation
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269.
Pollution can be controlled by
A
Sewage treatment
B
Checking atomic blasts
C
Manufacturing electrically operated vehicles
D
All of the above
Answer :
All of the above
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270.
Acid rain is caused by increase in the atmospheric concentration of:
A
$$SO_3$$ and $$CO$$
B
$$CO_2$$ and $$CO$$
C
$$O_3$$ and dust
D
$$SO_2$$ and $$NO_2$$
Answer :
$$SO_2$$ and $$NO_2$$
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