Microbiology Of Soils(Microbiology ) Questions and Answers
Question 1. The nonsymbiotic bacteria which fix nitrogen live in the soil independently are
Azotobacter
Clostridium
considerably less important in comparison to the symbiotic bacteria
D. all of the above
Explanation:-
Answer: Option D. -> D. all of the above
Question 2. Which of the following is capable of oxidizing sulfur to sulfates?
Thiobacillus thiooxidans
Desulfotomaculum
Rhodospirillum
Rhodomicrobium
Explanation:-
Answer: Option A. -> Thiobacillus thiooxidans
Question 3. Which of the following microorganism use H2S as the electron donor to reduce carbon dioxide?
Chromaticum
Chlorobium
Both (a) and (b)
Rhodomicrobium
Explanation:-
Answer: Option C. -> Both (a) and (b)
Question 4. Nitrogen fixation by the microorganisms can be detected by adopting the approach of
demonstrating growth in a nitrogen free medium
cultivating the microorganisms in the presence of nitrogen labeled with isotropic nitrogen
measuring15N2 by mass spectrometer
all of the above
Explanation:-
Answer: Option D. -> all of the above
Question 5. Nitrifying bacteria can not be isolated directly by the usual techniques employed to isolate hetrotrophic bacteria. The reasons may be due to
slow growth
medium growth
fast growth
none of these
Explanation:-
Answer: Option A. -> slow growth
Question 6. Which of the following is not the biofertilisers producing bacteria?
Nostoc
Anabaena
Both (a) and (b)
Clostridium
Explanation:-
Answer: Option D. -> Clostridium
Question 7. Most soil protozoa are flagellates or amoebas, having their dominant mode of nitrogen as
ingestion of bacteria
ingestion of mold
ingestion of fungi
all of these
Explanation:-
Answer: Option A. -> ingestion of bacteria
Question 8. Bacteria, as a group, are responsible for
nitrogen oxidation
sulfur oxidation
nitrogen fixation
all of these
Explanation:-
Answer: Option D. -> all of these
Question 9. . The population of algae in soil is __________ that of either bacteria or fungi.
generally smaller than
generally greater than
equal to
none of these
Explanation:-
Answer: Option A. -> generally smaller than
Question 10. The phenomenon of commensalism refers to a relationship between organisms in which
one species of a pair benefits
both the species of a pair benefit
one species of a pair is more benefited
none of the above
Explanation:-
Answer: Option A. -> one species of a pair benefits