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Microbiology of Soils

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

water
mold mycelium
all of these
minerals

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

Clostridium
Nostoc
Anabaena
Both (a) and (b)

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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

nitrogen fixation
ammonification
denitrification
nitrification

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

Achromobacter
None of these
Agrobacterium
Alcaligenes

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Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Clostridium
Rhizobium
Azotobacter
Beijerinckia

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