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Microbiology of Soils

Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Clostridium
Beijerinckia
Azotobacter
Rhizobium

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Microbiology of Soils
Denitrification is carried out

predominantly by Pseudomonas spp
usually by facultative anaerobes
All of these
predominantly by Bacillus spp

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

ATP
ammonia
nitrate
glucose

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Microbiology of Soils
Assimilative denitrification is done by

fungi
all of these
plants
prokaryotes

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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
Aspergillus niger
Candida torulopsis
Saccharomyces cerevisiae

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