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Microbiology of Soils

Microbiology of Soils
Bacteria, as a group, are responsible for

nitrogen fixation
sulfur oxidation
all of these
nitrogen oxidation

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Microbiology of Soils
Which of the following is capable of oxidizing sulfur to sulfates?

Rhodospirillum
Thiobacillus thiooxidans
Desulfotomaculum
Rhodomicrobium

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

ATP
nitrate
ammonia
glucose

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

Rhodomicrobium
Both (a) and (b)
Chlorobium
Chromaticum

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Microbiology of Soils
For rapid decomposition by microbes, the substrate should have a C/N ratio of

20-30
30-40
60-80
10-20

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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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