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Microbiology of Soils

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

soybean
bean and lupine
alfalfa and clover
all of these

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Microbiology of Soils
Nitrifying bacteria can not be isolated directly by the usual techniques employed to isolate hetrotrophic bacteria. The reasons may be due to

fast growth
slow growth
none of these
medium growth

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

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

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

Cyanobacteia
Pectin decomposing bacteria
Nitrifying bacteria
De-nitrifying bacteria

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

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

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Microbiology of Soils
Denitrification is carried out

usually by facultative anaerobes
predominantly by Bacillus spp
predominantly by Pseudomonas spp
All of these

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