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MCQs

Total Questions : 46 | Page 1 of 5 pages
Question 1.  The nonsymbiotic bacteria which fix nitrogen live in the soil independently are
  1.    Azotobacter
  2.    Clostridium
  3.    considerably less important in comparison to the symbiotic bacteria
  4.    D. all of the above
 Discuss Question
Answer: Option D. -> D. all of the above
Question 2.  Which of the following is capable of oxidizing sulfur to sulfates?
  1.    Thiobacillus thiooxidans
  2.    Desulfotomaculum
  3.    Rhodospirillum
  4.    Rhodomicrobium
 Discuss Question
Answer: Option A. -> Thiobacillus thiooxidans
Question 3.  Which of the following microorganism use H2S as the electron donor to reduce carbon dioxide?
  1.    Chromaticum
  2.    Chlorobium
  3.    Both (a) and (b)
  4.    Rhodomicrobium
 Discuss Question
Answer: Option C. -> Both (a) and (b)
Question 4.  Nitrogen fixation by the microorganisms can be detected by adopting the approach of
  1.    demonstrating growth in a nitrogen free medium
  2.    cultivating the microorganisms in the presence of nitrogen labeled with isotropic nitrogen
  3.    measuring15N2 by mass spectrometer
  4.    all of the above
 Discuss Question
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
  1.    slow growth
  2.    medium growth
  3.    fast growth
  4.    none of these
 Discuss Question
Answer: Option A. -> slow growth
Question 6.  Which of the following is not the biofertilisers producing bacteria?
  1.    Nostoc
  2.    Anabaena
  3.    Both (a) and (b)
  4.    Clostridium
 Discuss Question
Answer: Option D. -> Clostridium
Question 7.  Most soil protozoa are flagellates or amoebas, having their dominant mode of nitrogen as
  1.    ingestion of bacteria
  2.    ingestion of mold
  3.    ingestion of fungi
  4.    all of these
 Discuss Question
Answer: Option A. -> ingestion of bacteria
Question 8.  Bacteria, as a group, are responsible for
  1.    nitrogen oxidation
  2.    sulfur oxidation
  3.    nitrogen fixation
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Question 9. . The population of algae in soil is __________ that of either bacteria or fungi.
  1.    generally smaller than
  2.    generally greater than
  3.    equal to
  4.    none of these
 Discuss Question
Answer: Option A. -> generally smaller than
Question 10.  The phenomenon of commensalism refers to a relationship between organisms in which
  1.    one species of a pair benefits
  2.    both the species of a pair benefit
  3.    one species of a pair is more benefited
  4.    none of the above
 Discuss Question
Answer: Option A. -> one species of a pair benefits

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