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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

all of these
Micromonospora
Nocardia
Streptomyces

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

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

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

ammonia
glucose
nitrate
ATP

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

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

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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?

VA Mycorrhiza
Saccharomyces cerevisiae
Aspergillus niger
Candida torulopsis

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Microbiology of Soils
Bacteria, as a group, are responsible for

nitrogen fixation
all of these
sulfur oxidation
nitrogen oxidation

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