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Microbiology of Soils

Microbiology of Soils
The conversion of molecular nitrogen into ammonia is known as

nitrogen fixation
nitrification
ammonification
denitrification

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Microbiology of Soils
The physical structure of soil is improved by the accumulation of

mold mycelium
all of these
minerals
water

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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 benefits
one species of a pair is more benefited
both the species of a pair benefit

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Microbiology of Soils
Which are the main source of biofertilisers?

Cyanobacteria
None of these
Bacillus
Streptococcus

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Microbiology of Soils
Some microorganisms have the ability to increase the nitrogen content of soils, are called as

nitrogen fixation
denitrification
nitrification
all of these

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

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

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