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Microbiology of Soils

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

Both (a) and (b)
Anabaena
Clostridium
Nostoc

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Microbiology of Soils
Which of the following statement is not true about composition of biogas?

It is composed almost exclusively of methane and carbon dioxide
Both (a) and (b)
It also contains with traces of O2 and Cl2
It also contains with traces of H2S, N2, H2and CO

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

denitrification
nitrogen fixation
all of these
nitrification

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

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

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

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

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

Rhodomicrobium
Rhodospirillum
Thiobacillus thiooxidans
Desulfotomaculum

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