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Microbiology of Soils

Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Clostridium
Azotobacter
Rhizobium
Beijerinckia

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Microbiology of Soils
The physical structure of soil is improved by the accumulation of

water
all of these
minerals
mold mycelium

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Microbiology of Soils
The nitrogenase consists of

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

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

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

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Microbiology of Soils
The population of algae in soil is __________ that of either bacteria or fungi.

generally greater than
generally smaller than
none of these
equal to

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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
none of these
fast growth
medium growth

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