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Microbiology of Soils

Microbiology of Soils
The crops which are involved in nitrogen fixation are

soybean
alfalfa and clover
all of these
bean and lupine

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Microbiology of Soils
Some microorganisms have the ability to increase the nitrogen content of soils, are called as

nitrification
all of these
denitrification
nitrogen fixation

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Microbiology of Soils
Which of the following is capable of oxidizing sulfur to sulfates?

Rhodomicrobium
Rhodospirillum
Desulfotomaculum
Thiobacillus thiooxidans

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Microbiology of Soils
The nitrogenase consists of

dinitrogenase
both (a) and (b)
none of these
dinitrogenase reductase

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Microbiology of Soils
In the process of nitrogen fixation, which of the following microorganism is involved?

Symbiotic microorganisms only
None of these
Non symbiotic and symbiotic microorganisms only
Non symbiotic microorganisms only

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

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

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