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Microbiology of Soils

Microbiology of Soils
The breakdown of cattle manure in biogas is accomplished by which of the following type of bacteria?

methanogenic
All of these
Hydrolytic
Transitional

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

alfalfa and clover
all of these
soybean
bean and lupine

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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
medium growth
none of these

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

generally greater than
none of these
generally smaller than
equal to

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Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Beijerinckia
Rhizobium
Azotobacter
Clostridium

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

minerals
water
mold mycelium
all of these

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