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Microbiology of Soils

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

mold mycelium
water
all of these
minerals

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Microbiology of Soils
The transformation of nitrates to gaseous nitrogen is accomplished by microorganisms in a series of biochemical reactions. The process is known as

ammonification
nitrogen fixation
nitrification
denitrification

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Microbiology of Soils
The nonsymbiotic bacteria which fix nitrogen live in the soil independently are

All of these
Azotobacter
considerably less important in comparison to the symbiotic bacteria
Clostridium

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Microbiology of Soils
Most soil protozoa are flagellates or amoebas, having their dominant mode of nitrogen as

ingestion of fungi
all of these
ingestion of bacteria
ingestion of mold

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Microbiology of Soils
Which are the main source of biofertilisers?

None of these
Streptococcus
Bacillus
Cyanobacteria

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Microbiology of Soils
The nitrogenase consists of

dinitrogenase reductase
both (a) and (b)
none of these
dinitrogenase

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