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Microbiology of Soils

Microbiology of Soils
Degree of compost maturity can be assesed by

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

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

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

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

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

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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
Saccharomyces cerevisiae
Aspergillus niger
VA Mycorrhiza

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

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

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Microbiology of Soils
The diagnostic enzyme for denitrification is

nitro oxidoreductase
nitrate oxidase
none of these
nitrate reductase

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