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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
The microbial ecosystem of soil includes

None of these
biotic and abiotic components of soil
abiotic components of soil
biotic components of soil

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Microbiology of Soils
The organisms responsible for the characteristic musty or earth odor of a freshly plowed field is/are

Streptomyces
Nocardia
Micromonospora
all of these

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

minerals
mold mycelium
all of these
water

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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
Denitrification is carried out

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

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