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MCQs

Total Questions : 46 | Page 2 of 5 pages
Question 11. . The transformation of nitrates to gaseous nitrogen is accomplished by microorganisms in a series of biochemical reactions. The process is known as
  1.    nitrification
  2.    denitrification
  3.    nitrogen fixation
  4.    ammonification
 Discuss Question
Answer: Option B. -> denitrification
Question 12. . A heterocyst is
  1.    a type of spore
  2.    a terminally differentiated cell that fixes nitrogen
  3.    the progenitor of cyanobacterial vegetative cells
  4.    a cell that carries out oxygenic photosynthesis
 Discuss Question
Answer: Option B. -> a terminally differentiated cell that fixes nitrogen
Question 13. . The diagnostic enzyme for denitrification is
  1.    nitrate reductase
  2.    nitrate oxidase
  3.    nitro oxidoreductase
  4.    none of these
 Discuss Question
Answer: Option A. -> nitrate reductase
Question 14. . Nitrogen fixation refers to the direct conversion of atmospheric nitrogen gas into
  1.    ammonia
  2.    glucose
  3.    ATP
  4.    nitrate
 Discuss Question
Answer: Option A. -> ammonia
Question 15. . Which of the following is correct?
  1.    Mycorrhizae are fungi that form a mutually beneficial (symbiotic) relationship with plant roots
  2.    The fungi aid in transmitting nutrients and water to the plant roots
  3.    The increased nutrient availability from mycorrhizae is thought to be due to the additional absorbing surface provided by the fungi
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 16. . In the process of nitrogen fixation, which of the following microorganism is involved?
  1.    Non symbiotic microorganisms only
  2.    Symbiotic microorganisms only
  3.    Non symbiotic and symbiotic microorganisms only
  4.    None of the above
 Discuss Question
Answer: Option C. -> Non symbiotic and symbiotic microorganisms only
Question 17. . Nitrogen oxidation (nitrification)refers to the
  1.    conversion of ammonium ions into nitrates through the activities of certain bacteria.
  2.    changing of atmospheric nitrogen (N2) to nitrogen compounds
  3.    sulfur is oxidized to the sulfate form through Thiobacillus bacteria
  4.    none of the above
 Discuss Question
Answer: Option A. -> conversion of ammonium ions into nitrates through the activities of certain bacteria.
Question 18. . An example of a symbiotic nitrogen fixer is
  1.    Azotobacter
  2.    Beijerinckia
  3.    Clostridium
  4.    Rhizobium
 Discuss Question
Answer: Option D. -> Rhizobium
Question 19. . The groups of symbiotic bacteria, which have the ability to fix nitrogen
  1.    derive their food and minerals from the legume, and in turn they supply the legume with some or all of its nitrogen
  2.    grow together for a mutual benefit is called symbiosis and so these bacteria are called symbiotic nitrogen-fixing bacteria
  3.    these bacteria are from the genus, Rhizobium
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Question 20. . 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

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