Exercise: Microbiology Of Soils

Questions for: Microbiology Of Soils

__________ play a key role in the transformation of rock to soil.
A:
Cyanobacteia
B:
Pectin decomposing bacteria
C:
Nitrifying bacteria
D:
De-nitrifying bacteria
Answer: A
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The physical structure of soil is improved by the accumulation of
A:
mold mycelium
B:
minerals
C:
water
D:
all of these
Answer: A
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Which of the following statement is not true about composition of biogas?
A:
It is composed almost exclusively of methane and carbon dioxide
B:
It also contains with traces of H2S, N2, H2and CO
C:
It also contains with traces of O2 and Cl2
D:
Both (a) and (b)
Answer: C
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In the process of nitrogen fixation, which of the following microorganism is involved?
A:
Non symbiotic microorganisms only
B:
Symbiotic microorganisms only
C:
Non symbiotic and symbiotic microorganisms only
D:
None of the above
Answer: C
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An example of a symbiotic nitrogen fixer is
A:
Azotobacter
B:
Beijerinckia
C:
Clostridium
D:
Rhizobium
Answer: D
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