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Microbiology of Soils

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

Nostoc
Anabaena
Clostridium
Both (a) and (b)

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Microbiology of Soils
The physical structure of soil is improved by the accumulation of

minerals
mold mycelium
all of these
water

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

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Microbiology of Soils
The energy value of biogas is typically

400-700 BTU/ft3
1,000 BTU/ft3
more than 5000 BTU/ft3
1500 BTU/ft3

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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?

Aspergillus niger
Candida torulopsis
VA Mycorrhiza
Saccharomyces cerevisiae

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Microbiology of Soils
Nitrogen fixation refers to the direct conversion of atmospheric nitrogen gas into

glucose
nitrate
ATP
ammonia

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