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Microbiology of Soils

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

Nostoc
Anabaena
Clostridium
Both (a) and (b)

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

Pectin decomposing bacteria
Cyanobacteia
De-nitrifying bacteria
Nitrifying bacteria

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

sulfur oxidation
nitrogen fixation
nitrogen oxidation
all of these

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Microbiology of Soils
In the process of nitrogen fixation, which of the following microorganism is involved?

Non symbiotic microorganisms only
Non symbiotic and symbiotic microorganisms only
None of these
Symbiotic microorganisms only

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Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Beijerinckia
Clostridium
Azotobacter
Rhizobium

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Microbiology of Soils
The energy value of biogas is typically

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

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