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Microbiology of Soils

Microbiology of Soils
Nitrogen fixation refers to the direct conversion of atmospheric nitrogen gas into

nitrate
ATP
ammonia
glucose

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

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

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Microbiology of Soils
Which of the following species of different genera of bacteria are not capable of transforming nitrate to nitrogen?

None of these
Alcaligenes
Agrobacterium
Achromobacter

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

nitrogen fixation
nitrification
denitrification
all of these

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