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MICROBIOLOGY OF SOILS

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

Cyanobacteia
De-nitrifying bacteria
Nitrifying bacteria
Pectin decomposing bacteria

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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
nonsymbiotic
symbiotic
both (a) and (b)

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Microbiology of Soils
The nitrogenase consists of

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

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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
Denitrification may be distinguished as

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

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