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Microbiology of Soils

Microbiology of Soils
Assimilative denitrification is done by

fungi
plants
prokaryotes
all of these

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

all of these
minerals
water
mold mycelium

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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
medium growth
none of these
fast growth

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

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

nitrogen fixation
all of these
denitrification
nitrification

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

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

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