Microbiology of Soils

 

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Microbiology of Soils

Question 1
Denitrification is carried out
A
usually by facultative anaerobes
B
predominantly by Pseudomonas spp
C
predominantly by Bacillus spp
D
all of the above

Question 2
The energy value of biogas is typically
A
400-700 BTU/ft$^{3}$
B
1, 000 BTU/ft$^{3}$
C
1500 BTU/ft$^{3}$
D
more than 5000 BTU/ft$^{3}$

Question 3
Which of the following species of different genera of bacteria are not capable of transforming nitrate to nitrogen?
A
Achromobacter
B
Agrobacterium
C
Alcaligenes
D
None of these

Question 4
The organisms responsible for the characteristic musty or earth odor of a freshly plowed field is/are
A
Nocardia
B
Streptomyces
C
Micromonospora
D
all of these

Question 5
Nitrogen oxidation (nitrification)refers to the
A
conversion of ammonium ions into nitrates through the activities of certain bacteria.
B
changing of atmospheric nitrogen (N$_{2}$) to nitrogen compounds
C
sulfur is oxidized to the sulfate form through Thiobacillus bacteria
D
none of the above

Question 6
Some microorganisms have the ability to increase the nitrogen content of soils, are called as
A
nitrogen fixation
B
denitrification
C
nitrification
D
all of these

Question 7
The microbial ecosystem of soil includes
A
biotic components of soil
B
abiotic components of soil
C
biotic and abiotic components of soil
D
none of the above

Question 8
Nitrogen fixation
A
changes the free nitrogen (N$_{2}$) to a form usable by plants
B
especially changes nitrogen compounds, mostly amines such as NH$_{2}$
C
both (a) and (b)
D
fix the free nitrogen (N$_{2}$) by which it should not be usable by plants

Question 9
Assimilative denitrification is done by
A
plants
B
fungi
C
prokaryotes
D
all of these

Question 10
Syntrophism involves
A
exchange of nutrients between two species
B
exchange of nutrients among species
C
no exchange of nutrients between two species
D
no exchange of nutrients among species
There are 10 questions to complete.

 

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