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Microbiology of Soils

Microbiology of Soils
Denitrification may be distinguished as

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

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Microbiology of Soils
__________ play a key role in the transformation of rock to soil.

De-nitrifying bacteria
Cyanobacteia
Nitrifying bacteria
Pectin decomposing bacteria

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

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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
ammonification
nitrogen fixation
denitrification

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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?

Candida torulopsis
Aspergillus niger
VA Mycorrhiza
Saccharomyces cerevisiae

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Microbiology of Soils
The nitrogenase consists of

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

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