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Microbiology of Soils

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

all of these
soybean
bean and lupine
alfalfa and clover

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Microbiology of Soils
__________ play a key role in the transformation of rock to soil.

Cyanobacteia
Nitrifying bacteria
Pectin decomposing bacteria
De-nitrifying bacteria

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Microbiology of Soils
Denitrification is carried out

usually by facultative anaerobes
predominantly by Pseudomonas spp
predominantly by Bacillus spp
All of these

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

nitrate oxidase
nitrogenase
none of these
nitrate reductase

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Microbiology of Soils
Which are the main source of biofertilisers?

Streptococcus
None of these
Cyanobacteria
Bacillus

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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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