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Microbiology of Soils

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

denitrification
ammonification
nitrification
nitrogen fixation

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Microbiology of Soils
Which of the following soil microorganism is involved in the reduction of sulfates to H2S?

Thiobacillus thiooxidans
Rhodospirillum
Rhodomicrobium
Desulfotomaculum

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Microbiology of Soils
The diagnostic enzyme for nitrogen-fixing organisms is

nitrate oxidase
none of these
nitrate reductase
nitrogenase

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

Both (a) and (b)
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

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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
Aspergillus niger
Candida torulopsis
VA Mycorrhiza

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Microbiology of Soils
Nitrifying bacteria can not be isolated directly by the usual techniques employed to isolate hetrotrophic bacteria. The reasons may be due to

slow growth
medium growth
none of these
fast growth

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