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Microbiology of Soils

Microbiology of Soils
Assimilative denitrification is done by

all of these
plants
prokaryotes
fungi

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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
none of these
equal to

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

Rhodospirillum
Desulfotomaculum
Rhodomicrobium
Thiobacillus thiooxidans

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

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

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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?

None of these
Agrobacterium
Achromobacter
Alcaligenes

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Microbiology of Soils
The crops which are involved in nitrogen fixation are

all of these
soybean
alfalfa and clover
bean and lupine

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