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Microbiology of Soils

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

Anabaena
Clostridium
Both (a) and (b)
Nostoc

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

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

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

denitrification
all of these
nitrogen fixation
nitrification

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Microbiology of Soils
The population of algae in soil is __________ that of either bacteria or fungi.

none of these
generally smaller than
equal to
generally greater than

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Microbiology of Soils
Degree of compost maturity can be assesed by

None of these
infrared technique
germination test
both (a) and (b)

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Microbiology of Soils
The groups of bacteria which have the ability to fix nitrogen from air to soil are

none of these
both (a) and (b)
nonsymbiotic
symbiotic

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