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Microbiology of Soils

Microbiology of Soils
The diagnostic enzyme for nitrogen-fixing organisms is

nitrate oxidase
nitrogenase
nitrate reductase
none of these

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Microbiology of Soils
Which are the main source of biofertilisers?

Streptococcus
Bacillus
Cyanobacteria
None of these

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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?

None of these
Agrobacterium
Alcaligenes
Achromobacter

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

glucose
nitrate
ATP
ammonia

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Microbiology of Soils
Most soil protozoa are flagellates or amoebas, having their dominant mode of nitrogen as

all of these
ingestion of mold
ingestion of fungi
ingestion of bacteria

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

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

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