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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?

Rhodomicrobium
Chlorobium
Both (a) and (b)
Chromaticum

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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
VA Mycorrhiza
Candida torulopsis
Saccharomyces cerevisiae

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

nitrogen fixation
denitrification
nitrification
ammonification

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Microbiology of Soils
Which of the following species of different genera of bacteria are not capable of transforming nitrate to nitrogen?

Achromobacter
Agrobacterium
None of these
Alcaligenes

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

equal to
generally greater than
generally smaller than
none of these

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Microbiology of Soils
The phenomenon of commensalism refers to a relationship between organisms in which

one species of a pair is more benefited
None of these
both the species of a pair benefit
one species of a pair benefits

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