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Microbiology of Soils

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

nitrate
ammonia
ATP
glucose

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Microbiology of Soils
The transformation of nitrates to gaseous nitrogen is accomplished by microorganisms in a series of biochemical reactions. The process is known as

nitrification
nitrogen fixation
denitrification
ammonification

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

nitrogen fixation
denitrification
ammonification
nitrification

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

Both (a) and (b)
Rhodomicrobium
Chromaticum
Chlorobium

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Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Clostridium
Beijerinckia
Rhizobium
Azotobacter

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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?

Candida torulopsis
Aspergillus niger
Saccharomyces cerevisiae
VA Mycorrhiza

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