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Microbiology of Soils

Microbiology of Soils
The nitrogenase consists of

dinitrogenase
none of these
both (a) and (b)
dinitrogenase reductase

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

Both (a) and (b)
Anabaena
Clostridium
Nostoc

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

Pectin decomposing bacteria
Nitrifying bacteria
De-nitrifying bacteria
Cyanobacteia

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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

medium growth
none of these
slow growth
fast growth

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

none of these
generally greater than
equal to
generally smaller than

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Microbiology of Soils
Most soil protozoa are flagellates or amoebas, having their dominant mode of nitrogen as

ingestion of mold
all of these
ingestion of bacteria
ingestion of fungi

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