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Microbiology of Soils

Microbiology of Soils
Which are the main source of biofertilisers?

Cyanobacteria
Streptococcus
None of these
Bacillus

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

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

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Microbiology of Soils
Assimilative denitrification is done by

plants
prokaryotes
fungi
all of these

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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
all of these
nitrification

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Microbiology of Soils
Denitrification is carried out

predominantly by Bacillus spp
usually by facultative anaerobes
predominantly by Pseudomonas spp
All of these

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