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Microbiology of Soils

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

alfalfa and clover
bean and lupine
soybean
all of these

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Microbiology of Soils
Which of the following soil microorganism is involved in the reduction of sulfates to H2S?

Rhodomicrobium
Thiobacillus thiooxidans
Rhodospirillum
Desulfotomaculum

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Microbiology of Soils
The nitrogenase consists of

dinitrogenase reductase
dinitrogenase
none of these
both (a) and (b)

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Microbiology of Soils
Denitrification may be distinguished as

assimilative
blue baby syndrome
dissimilative
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

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

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

generally greater than
equal to
generally smaller than
none of these

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