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Microbiology of Soils

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
Which of the following is not the biofertilisers producing bacteria?

Anabaena
Clostridium
Both (a) and (b)
Nostoc

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Microbiology of Soils
The nonsymbiotic bacteria which fix nitrogen live in the soil independently are

All of these
considerably less important in comparison to the symbiotic bacteria
Clostridium
Azotobacter

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Microbiology of Soils
The population of algae in soil is __________ that of either bacteria or fungi.

generally smaller than
none of these
equal to
generally greater than

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

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

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Microbiology of Soils
Nitrifying bacteria can not be isolated directly by the usual techniques employed to isolate hetrotrophic bacteria. The reasons may be due to

none of these
fast growth
slow growth
medium growth

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