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Microbiology of Soils

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

alfalfa and clover
bean and lupine
soybean
all of these

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

Thiobacillus thiooxidans
Desulfotomaculum
Rhodospirillum
Rhodomicrobium

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Microbiology of Soils
The nitrogenase consists of

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

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

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

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Microbiology of Soils
Degree of compost maturity can be assesed by

germination test
infrared technique
None of these
both (a) and (b)

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Microbiology of Soils
For rapid decomposition by microbes, the substrate should have a C/N ratio of

30-40
10-20
20-30
60-80

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