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Microbiology of Soils

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

minerals
water
all of these
mold mycelium

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Microbiology of Soils
The energy value of biogas is typically

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

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Microbiology of Soils
Which are the main source of biofertilisers?

Streptococcus
None of these
Bacillus
Cyanobacteria

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Microbiology of Soils
An example of a symbiotic nitrogen fixer is

Beijerinckia
Azotobacter
Clostridium
Rhizobium

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Microbiology of Soils
Denitrification may be distinguished as

both (a) and (b)
assimilative
dissimilative
blue baby syndrome

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Microbiology of Soils
Nitrifying bacteria can not be isolated directly by the usual techniques employed to isolate hetrotrophic bacteria. The reasons may be due to

slow growth
fast growth
none of these
medium growth

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