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Microbiology of Soils

Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Clostridium
Rhizobium
Beijerinckia
Azotobacter

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Microbiology of Soils
Denitrification may be distinguished as

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

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Microbiology of Soils
Nitrifying bacteria can not be isolated directly by the usual techniques employed to isolate hetrotrophic bacteria. The reasons may be due to

medium growth
fast growth
none of these
slow growth

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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?

Alcaligenes
None of these
Agrobacterium
Achromobacter

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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
Aspergillus niger
VA Mycorrhiza
Saccharomyces cerevisiae

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Microbiology of Soils
The organisms responsible for the characteristic musty or earth odor of a freshly plowed field is/are

Nocardia
all of these
Micromonospora
Streptomyces

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