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Microbiology of Soils

Microbiology of Soils
Denitrification may be distinguished as

blue baby syndrome
dissimilative
both (a) and (b)
assimilative

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Microbiology of Soils
Which of the following statement is not true about composition of biogas?

Both (a) and (b)
It is composed almost exclusively of methane and carbon dioxide
It also contains with traces of O2 and Cl2
It also contains with traces of H2S, N2, H2and CO

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Microbiology of Soils
Which of the following species of different genera of bacteria are not capable of transforming nitrate to nitrogen?

Alcaligenes
Agrobacterium
None of these
Achromobacter

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Microbiology of Soils
The phenomenon of commensalism refers to a relationship between organisms in which

None of these
one species of a pair is more benefited
both the species of a pair benefit
one species of a pair benefits

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Microbiology of Soils
The groups of bacteria which have the ability to fix nitrogen from air to soil are

symbiotic
nonsymbiotic
none of these
both (a) and (b)

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Microbiology of Soils
For rapid decomposition by microbes, the substrate should have a C/N ratio of

20-30
60-80
30-40
10-20

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