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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?

Both (a) and (b)
Chlorobium
Rhodomicrobium
Chromaticum

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Microbiology of Soils
The microbial ecosystem of soil includes

None of these
biotic and abiotic components of soil
biotic components of soil
abiotic components of soil

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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?

Aspergillus niger
Saccharomyces cerevisiae
VA Mycorrhiza
Candida torulopsis

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Microbiology of Soils
The population of algae in soil is __________ that of either bacteria or fungi.

generally greater than
none of these
equal to
generally smaller than

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Microbiology of Soils
Denitrification is carried out

predominantly by Pseudomonas spp
predominantly by Bacillus spp
All of these
usually by facultative anaerobes

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

Rhodomicrobium
Desulfotomaculum
Rhodospirillum
Thiobacillus thiooxidans

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