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Microbiology of Soils

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

all of these
water
minerals
mold mycelium

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Microbiology of Soils
The crops which are involved in nitrogen fixation are

soybean
all of these
alfalfa and clover
bean and lupine

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

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

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Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Rhizobium
Clostridium
Azotobacter
Beijerinckia

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

Clostridium
Nostoc
Anabaena
Both (a) and (b)

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

denitrification
ammonification
nitrification
nitrogen fixation

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