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Microbiology of Soils

Microbiology of Soils
Which are the main source of biofertilisers?

Bacillus
Cyanobacteria
Streptococcus
None of these

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

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

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Microbiology of Soils
The phenomenon of commensalism refers to a relationship between organisms in which

one species of a pair benefits
one species of a pair is more benefited
None of these
both the species of a pair benefit

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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
60-80
20-30

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Microbiology of Soils
Which of the following fungi on infecting crop roots can improve their uptake of phosphorus and other nutrients?

VA Mycorrhiza
Candida torulopsis
Aspergillus niger
Saccharomyces cerevisiae

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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?

Agrobacterium
Achromobacter
None of these
Alcaligenes

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