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Microbiology of Soils

Microbiology of Soils
Denitrification may be distinguished as

assimilative
both (a) and (b)
dissimilative
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

symbiotic
nonsymbiotic
both (a) and (b)
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

denitrification
all of these
nitrogen fixation
nitrification

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Microbiology of Soils
The conversion of molecular nitrogen into ammonia is known as

denitrification
nitrification
nitrogen fixation
ammonification

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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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Microbiology of Soils
Which of the following is not the biofertilisers producing bacteria?

Nostoc
Anabaena
Both (a) and (b)
Clostridium

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