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Microbiology of Soils

Microbiology of Soils
The organisms responsible for the characteristic musty or earth odor of a freshly plowed field is/are

Micromonospora
Nocardia
all of these
Streptomyces

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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
nonsymbiotic
both (a) and (b)
symbiotic

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

glucose
ATP
ammonia
nitrate

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

Thiobacillus thiooxidans
Rhodospirillum
Rhodomicrobium
Desulfotomaculum

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

generally smaller than
generally greater than
equal to
none of these

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Microbiology of Soils
Which are the main source of biofertilisers?

None of these
Bacillus
Streptococcus
Cyanobacteria

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