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Microbiology of Soils

Microbiology of Soils
Denitrification may be distinguished as

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

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

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

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Microbiology of Soils
Most soil protozoa are flagellates or amoebas, having their dominant mode of nitrogen as

ingestion of mold
ingestion of bacteria
all of these
ingestion of fungi

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

nitrification
all of these
nitrogen fixation
denitrification

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

Rhodospirillum
Thiobacillus thiooxidans
Rhodomicrobium
Desulfotomaculum

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Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Rhizobium
Clostridium
Beijerinckia
Azotobacter

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