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Microbiology of Soils

Microbiology of Soils
The diagnostic enzyme for nitrogen-fixing organisms is

none of these
nitrate reductase
nitrate oxidase
nitrogenase

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

alfalfa and clover
soybean
all of these
bean and lupine

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Microbiology of Soils
The breakdown of cattle manure in biogas is accomplished by which of the following type of bacteria?

All of these
Transitional
methanogenic
Hydrolytic

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

ATP
nitrate
ammonia
glucose

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

Rhodomicrobium
Rhodospirillum
Thiobacillus thiooxidans
Desulfotomaculum

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Microbiology of Soils
Which of the following fungi on infecting crop roots can improve their uptake of phosphorus and other nutrients?

Saccharomyces cerevisiae
Candida torulopsis
Aspergillus niger
VA Mycorrhiza

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