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Microbiology of Soils

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

all of these
alfalfa and clover
bean and lupine
soybean

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

slow growth
fast growth
none of these
medium growth

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Microbiology of Soils
Bacteria, as a group, are responsible for

all of these
nitrogen fixation
sulfur oxidation
nitrogen oxidation

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Microbiology of Soils
Assimilative denitrification is done by

fungi
prokaryotes
plants
all of these

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

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

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