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Microbiology of Soils

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

nitrogenase
nitrate reductase
none of these
nitrate oxidase

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

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

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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
Achromobacter
Alcaligenes

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Microbiology of Soils
The diagnostic enzyme for denitrification is

none of these
nitrate reductase
nitro oxidoreductase
nitrate oxidase

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Microbiology of Soils
The groups of bacteria which have the ability to fix nitrogen from air to soil are

symbiotic
both (a) and (b)
none of these
nonsymbiotic

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Microbiology of Soils
The microbial ecosystem of soil includes

biotic components of soil
abiotic components of soil
biotic and abiotic components of soil
None of these

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