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Microbiology of Soils

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

denitrification
nitrification
ammonification
nitrogen fixation

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Microbiology of Soils
The nonsymbiotic bacteria which fix nitrogen live in the soil independently are

Azotobacter
considerably less important in comparison to the symbiotic bacteria
Clostridium
All of these

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Microbiology of Soils
The microbial ecosystem of soil includes

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

Candida torulopsis
VA Mycorrhiza
Saccharomyces cerevisiae
Aspergillus niger

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Microbiology of Soils
The organisms responsible for the characteristic musty or earth odor of a freshly plowed field is/are

Micromonospora
Nocardia
Streptomyces
all of these

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

Chromaticum
Chlorobium
Both (a) and (b)
Rhodomicrobium

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