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Microbiology of Soils

Microbiology of Soils
Denitrification may be distinguished as

dissimilative
assimilative
both (a) and (b)
blue baby syndrome

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Microbiology of Soils
The groups of bacteria which have the ability to fix nitrogen from air to soil are

both (a) and (b)
none of these
nonsymbiotic
symbiotic

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

all of these
Streptomyces
Micromonospora
Nocardia

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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
Clostridium
Azotobacter

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Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Clostridium
Rhizobium
Beijerinckia
Azotobacter

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Microbiology of Soils
The phenomenon of commensalism refers to a relationship between organisms in which

one species of a pair benefits
both the species of a pair benefit
None of these
one species of a pair is more benefited

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