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Microbiology of Soils

Microbiology of Soils
Nitrogen fixation refers to the direct conversion of atmospheric nitrogen gas into

nitrate
ATP
glucose
ammonia

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Microbiology of Soils
The diagnostic enzyme for denitrification is

none of these
nitrate reductase
nitro oxidoreductase
nitrate oxidase

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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?

Saccharomyces cerevisiae
VA Mycorrhiza
Aspergillus niger
Candida torulopsis

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Microbiology of Soils
Which of the following statement is not true about composition of biogas?

It also contains with traces of H2S, N2, H2and CO
It also contains with traces of O2 and Cl2
It is composed almost exclusively of methane and carbon dioxide
Both (a) and (b)

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Microbiology of Soils
In the process of nitrogen fixation, which of the following microorganism is involved?

None of these
Symbiotic microorganisms only
Non symbiotic microorganisms only
Non symbiotic and symbiotic microorganisms only

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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

nitrification
denitrification
nitrogen fixation
ammonification

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