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MCQs

Total Questions : 186 | Page 10 of 19 pages
Question 91. In which of the following water bodies, fertility is high?
  1.    open sea
  2.    coastal regions
  3.    lakes
  4.    rivers
 Discuss Question
Answer: Option B. -> coastal regions
Answer: (b).coastal regions
Question 92. 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.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Answer: (d).all of the above
Question 93. Which of the following product is not obtained from dissimilation of organic matter under aerobic conditions?
  1.    ammonium
  2.    sulphate
  3.    methane
  4.    phosphate
 Discuss Question
Answer: Option C. -> methane
Answer: (c).methane
Question 94. 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
Answer: (d).all of the above
Question 95. 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
Answer: (a).ingestion of bacteria
Question 96. 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
Answer: (a).Thiobacillus thiooxidans
Question 97. 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
Answer: (d).Clostridium
Question 98. 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)
Answer: (c).Both (a) and (b)
Question 99. An example of a symbiotic nitrogen fixer is
  1.    Azotobacter
  2.    Beijerinckia
  3.    Clostridium
  4.    Rhizobium
 Discuss Question
Answer: Option D. -> Rhizobium
Answer: (d).Rhizobium
Question 100. Which of the following statement is not true about composition of biogas?
  1.    It is composed almost exclusively of methane and carbon dioxide
  2.    It also contains with traces of H2S, N2, H2and CO
  3.    It also contains with traces of O2 and Cl2
  4.    Both (a) and (b)
 Discuss Question
Answer: Option C. -> It also contains with traces of O2 and Cl2
Answer: (c).It also contains with traces of O2 and Cl2

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