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Microbiology of Soils

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

nitrogen fixation
denitrification
nitrification
ammonification

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

minerals
mold mycelium
water
all of these

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

Nostoc
Clostridium
Anabaena
Both (a) and (b)

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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 fungi
ingestion of bacteria

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Microbiology of Soils
__________ play a key role in the transformation of rock to soil.

Cyanobacteia
Pectin decomposing bacteria
Nitrifying bacteria
De-nitrifying bacteria

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Microbiology of Soils
The energy value of biogas is typically

more than 5000 BTU/ft3
1,000 BTU/ft3
400-700 BTU/ft3
1500 BTU/ft3

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