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Microbiology of Soils

Microbiology of Soils
Which of the following is not the biofertilisers producing bacteria?

Clostridium
Nostoc
Anabaena
Both (a) and (b)

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Microbiology of Soils
The nonsymbiotic bacteria which fix nitrogen live in the soil independently are

Clostridium
All of these
Azotobacter
considerably less important in comparison to the symbiotic bacteria

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Microbiology of Soils
Bacteria, as a group, are responsible for

nitrogen oxidation
nitrogen fixation
sulfur oxidation
all of these

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

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

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

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Microbiology of Soils
The energy value of biogas is typically

more than 5000 BTU/ft3
1,000 BTU/ft3
1500 BTU/ft3
400-700 BTU/ft3

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