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Microbiology of Soils

Microbiology of Soils
Bacteria, as a group, are responsible for

nitrogen fixation
all of these
nitrogen oxidation
sulfur oxidation

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Microbiology of Soils
Which of the following statement is not true about composition of biogas?

It also contains with traces of O2 and Cl2
It is composed almost exclusively of methane and carbon dioxide
Both (a) and (b)
It also contains with traces of H2S, N2, H2and CO

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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?

Alcaligenes
Achromobacter
Agrobacterium
None of these

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Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Rhizobium
Beijerinckia
Clostridium
Azotobacter

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

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

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Microbiology of Soils
Denitrification may be distinguished as

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

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