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Microbiology of Soils

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

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

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Microbiology of Soils
The conversion of molecular nitrogen into ammonia is known as

denitrification
nitrogen fixation
ammonification
nitrification

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

bean and lupine
alfalfa and clover
all of these
soybean

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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
Streptomyces
Micromonospora
all of these

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Microbiology of Soils
Which of the following is not the biofertilisers producing bacteria?

Both (a) and (b)
Clostridium
Nostoc
Anabaena

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Microbiology of Soils
Which of the following soil microorganism is involved in the reduction of sulfates to H2S?

Desulfotomaculum
Rhodospirillum
Thiobacillus thiooxidans
Rhodomicrobium

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