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Microbiology of Soils

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

Nostoc
Clostridium
Both (a) and (b)
Anabaena

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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?

None of these
Agrobacterium
Achromobacter
Alcaligenes

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Microbiology of Soils
The crops which are involved in nitrogen fixation are

bean and lupine
alfalfa and clover
all of these
soybean

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Microbiology of Soils
Which of the following microorganism use H2S as the electron donor to reduce carbon dioxide?

Rhodomicrobium
Chlorobium
Chromaticum
Both (a) and (b)

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

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

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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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