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Microbiology of Soils

Microbiology of Soils
Which of the following microorganism use H2S as the electron donor to reduce carbon dioxide?

Chlorobium
Chromaticum
Both (a) and (b)
Rhodomicrobium

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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?

VA Mycorrhiza
Saccharomyces cerevisiae
Aspergillus niger
Candida torulopsis

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

none of these
nitrate oxidase
nitrogenase
nitrate reductase

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

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

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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

none of these
slow growth
medium growth
fast growth

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

mold mycelium
water
all of these
minerals

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