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Microbiology of Soils

Microbiology of Soils
The nitrogenase consists of

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

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

minerals
mold mycelium
water
all of these

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Microbiology of Soils
The phenomenon of commensalism refers to a relationship between organisms in which

one species of a pair benefits
one species of a pair is more benefited
None of these
both the species of a pair benefit

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Microbiology of Soils
Which of the following fungi on infecting crop roots can improve their uptake of phosphorus and other nutrients?

Aspergillus niger
Candida torulopsis
Saccharomyces cerevisiae
VA Mycorrhiza

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Microbiology of Soils
The breakdown of cattle manure in biogas is accomplished by which of the following type of bacteria?

methanogenic
All of these
Transitional
Hydrolytic

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Microbiology of Soils
The conversion of molecular nitrogen into ammonia is known as

ammonification
denitrification
nitrogen fixation
nitrification

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