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Microbiology of Soils

Microbiology of Soils
Denitrification may be distinguished as

dissimilative
assimilative
blue baby syndrome
both (a) and (b)

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Microbiology of Soils
Which of the following microorganism use H2S as the electron donor to reduce carbon dioxide?

Rhodomicrobium
Chromaticum
Chlorobium
Both (a) and (b)

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

bean and lupine
all of these
soybean
alfalfa and clover

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Microbiology of Soils
The diagnostic enzyme for nitrogen-fixing organisms is

nitrogenase
nitrate reductase
nitrate oxidase
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?

Achromobacter
Alcaligenes
Agrobacterium
None of these

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

De-nitrifying bacteria
Cyanobacteia
Pectin decomposing bacteria
Nitrifying bacteria

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