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Microbiology of Soils

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

Clostridium
Anabaena
Both (a) and (b)
Nostoc

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Microbiology of Soils
Which of the following soil microorganism is involved in the reduction of sulfates to H2S?

Rhodomicrobium
Thiobacillus thiooxidans
Rhodospirillum
Desulfotomaculum

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

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

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Microbiology of Soils
The diagnostic enzyme for nitrogen-fixing organisms is

nitrogenase
nitrate oxidase
nitrate reductase
none of these

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Microbiology of Soils
In the process of nitrogen fixation, which of the following microorganism is involved?

Symbiotic microorganisms only
None of these
Non symbiotic and symbiotic microorganisms only
Non symbiotic microorganisms only

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Microbiology of Soils
Denitrification may be distinguished as

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

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