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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
Pectin decomposing bacteria
Nitrifying bacteria

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

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

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Microbiology of Soils
The nitrogenase consists of

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

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Microbiology of Soils
The crops which are involved in nitrogen fixation are

alfalfa and clover
soybean
all of these
bean and lupine

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Microbiology of Soils
Denitrification may be distinguished as

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

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