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Microbiology of Soils

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

alfalfa and clover
bean and lupine
all of these
soybean

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

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

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Microbiology of Soils
The nitrogenase consists of

none of these
dinitrogenase
both (a) and (b)
dinitrogenase reductase

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Microbiology of Soils
__________ play a key role in the transformation of rock to soil.

Pectin decomposing bacteria
Nitrifying bacteria
Cyanobacteia
De-nitrifying bacteria

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

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

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

Desulfotomaculum
Thiobacillus thiooxidans
Rhodomicrobium
Rhodospirillum

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