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Microbiology of Soils

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

Both (a) and (b)
Nostoc
Anabaena
Clostridium

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Microbiology of Soils
The physical structure of soil is improved by the accumulation of

all of these
water
mold mycelium
minerals

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Microbiology of Soils
Which of the following species of different genera of bacteria are not capable of transforming nitrate to nitrogen?

Alcaligenes
Agrobacterium
Achromobacter
None of these

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

all of these
sulfur oxidation
nitrogen oxidation
nitrogen fixation

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Microbiology of Soils
The transformation of nitrates to gaseous nitrogen is accomplished by microorganisms in a series of biochemical reactions. The process is known as

ammonification
nitrogen fixation
denitrification
nitrification

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Microbiology of Soils
The nitrogenase consists of

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

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