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Microbiology of Soils

Microbiology of Soils
For rapid decomposition by microbes, the substrate should have a C/N ratio of

60-80
30-40
20-30
10-20

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Microbiology of Soils
The groups of bacteria which have the ability to fix nitrogen from air to soil are

both (a) and (b)
nonsymbiotic
symbiotic
none of these

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Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Rhizobium
Azotobacter
Beijerinckia
Clostridium

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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
all of these
Streptomyces
Nocardia

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

nitrification
ammonification
nitrogen fixation
denitrification

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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
none of these
slow growth

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