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Microbiology of Soils

Microbiology of Soils
Denitrification may be distinguished as

blue baby syndrome
assimilative
both (a) and (b)
dissimilative

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Microbiology of Soils
Which of the following species of different genera of bacteria are not capable of transforming nitrate to nitrogen?

Agrobacterium
Alcaligenes
Achromobacter
None of these

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Microbiology of Soils
__________ play a key role in the transformation of rock to soil.

De-nitrifying bacteria
Nitrifying bacteria
Pectin decomposing bacteria
Cyanobacteia

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Microbiology of Soils
Denitrification is carried out

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

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Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Clostridium
Azotobacter
Beijerinckia
Rhizobium

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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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