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Microbiology of Soils

Microbiology of Soils
The physical structure of soil is improved by the accumulation of

water
all of these
minerals
mold mycelium

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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?

Alcaligenes
Agrobacterium
None of these
Achromobacter

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Microbiology of Soils
Nitrifying bacteria can not be isolated directly by the usual techniques employed to isolate hetrotrophic bacteria. The reasons may be due to

fast growth
none of these
medium growth
slow growth

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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?

Aspergillus niger
Candida torulopsis
VA Mycorrhiza
Saccharomyces cerevisiae

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

Desulfotomaculum
Rhodospirillum
Thiobacillus thiooxidans
Rhodomicrobium

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Microbiology of Soils
The microbial ecosystem of soil includes

biotic components of soil
abiotic components of soil
None of these
biotic and abiotic components of soil

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