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Microbiology of Soils

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

water
mold mycelium
minerals
all of these

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

ammonia
ATP
glucose
nitrate

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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?

VA Mycorrhiza
Aspergillus niger
Candida torulopsis
Saccharomyces cerevisiae

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Microbiology of Soils
The diagnostic enzyme for denitrification is

nitrate reductase
nitro oxidoreductase
none of these
nitrate oxidase

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Microbiology of Soils
Most soil protozoa are flagellates or amoebas, having their dominant mode of nitrogen as

ingestion of fungi
all of these
ingestion of mold
ingestion of bacteria

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Microbiology of Soils
Degree of compost maturity can be assesed by

infrared technique
both (a) and (b)
germination test
None of these

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