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Microbiology of Soils

Microbiology of Soils
Denitrification may be distinguished as

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

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

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

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Microbiology of Soils
Which of the following species of different genera of bacteria are not capable of transforming nitrate to nitrogen?

Alcaligenes
Achromobacter
None of these
Agrobacterium

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

generally greater than
generally smaller than
equal to
none of these

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Microbiology of Soils
Some microorganisms have the ability to increase the nitrogen content of soils, are called as

all of these
denitrification
nitrogen fixation
nitrification

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