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Microbiology of Soils

Microbiology of Soils
Degree of compost maturity can be assesed by

both (a) and (b)
None of these
infrared technique
germination test

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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
An example of a symbiotic nitrogen fixer is

Beijerinckia
Rhizobium
Azotobacter
Clostridium

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

ammonia
ATP
glucose
nitrate

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

nitrogen oxidation
sulfur oxidation
nitrogen fixation
all of these

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

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

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