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Microbiology of Soils

Microbiology of Soils
Which of the following is not the biofertilisers producing bacteria?

Nostoc
Anabaena
Both (a) and (b)
Clostridium

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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
Candida torulopsis
Aspergillus niger
Saccharomyces cerevisiae

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Microbiology of Soils
The diagnostic enzyme for denitrification is

nitrate oxidase
none of these
nitrate reductase
nitro oxidoreductase

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Microbiology of Soils
The nitrogenase consists of

both (a) and (b)
none of these
dinitrogenase
dinitrogenase reductase

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

nitrogen oxidation
all of these
sulfur oxidation
nitrogen fixation

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

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

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