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Microbiology of Soils

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
Which of the following fungi on infecting crop roots can improve their uptake of phosphorus and other nutrients?

Candida torulopsis
VA Mycorrhiza
Aspergillus niger
Saccharomyces cerevisiae

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

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

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Microbiology of Soils
The crops which are involved in nitrogen fixation are

alfalfa and clover
all of these
soybean
bean and lupine

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

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

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Microbiology of Soils
The diagnostic enzyme for denitrification is

none of these
nitrate oxidase
nitro oxidoreductase
nitrate reductase

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