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Microbiology of Soils

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

denitrification
nitrogen fixation
ammonification
nitrification

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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
Candida torulopsis
Saccharomyces cerevisiae
VA Mycorrhiza

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Microbiology of Soils
In the process of nitrogen fixation, which of the following microorganism is involved?

None of these
Non symbiotic microorganisms only
Symbiotic microorganisms only
Non symbiotic and symbiotic microorganisms only

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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

medium growth
fast growth
slow growth
none of these

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

Rhodospirillum
Desulfotomaculum
Thiobacillus thiooxidans
Rhodomicrobium

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Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Beijerinckia
Clostridium
Rhizobium
Azotobacter

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