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MCQs

Total Questions : 46 | Page 3 of 5 pages
Question 21. . The physical structure of soil is improved by the accumulation of
  1.    mold mycelium
  2.    minerals
  3.    water
  4.    all of these
 Discuss Question
Answer: Option A. -> mold mycelium
Question 22. . The breakdown of cattle manure in biogas is accomplished by which of the following type of bacteria?
  1.    Hydrolytic
  2.    Transitional
  3.    methanogenic
  4.    All of these
 Discuss Question
Answer: Option D. -> All of these
Question 23. . The conversion of molecular nitrogen into ammonia is known as
  1.    nitrification
  2.    denitrification
  3.    nitrogen fixation
  4.    ammonification
 Discuss Question
Answer: Option C. -> nitrogen fixation
Question 24. . Denitrification may be distinguished as
  1.    dissimilative
  2.    assimilative
  3.    both (a) and (b)
  4.    blue baby syndrome
 Discuss Question
Answer: Option C. -> both (a) and (b)
Question 25. . The crops which are involved in nitrogen fixation are
  1.    alfalfa and clover
  2.    soybean
  3.    bean and lupine
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Question 26. . The groups of bacteria which have the ability to fix nitrogen from air to soil are
  1.    symbiotic
  2.    nonsymbiotic
  3.    both (a) and (b)
  4.    none of these
 Discuss Question
Answer: Option C. -> both (a) and (b)
Question 27. . The nitrogenase consists of
  1.    dinitrogenase
  2.    dinitrogenase reductase
  3.    both (a) and (b)
  4.    none of these
 Discuss Question
Answer: Option C. -> both (a) and (b)
Question 28. . __________ play a key role in the transformation of rock to soil.
  1.    Cyanobacteia
  2.    Pectin decomposing bacteria
  3.    Nitrifying bacteria
  4.    De-nitrifying bacteria
 Discuss Question
Answer: Option A. -> Cyanobacteia
Question 29. . Which of the following species of different genera of bacteria are not capable of transforming nitrate to nitrogen?
  1.    Achromobacter
  2.    Agrobacterium
  3.    Alcaligenes
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 30. . For rapid decomposition by microbes, the substrate should have a C/N ratio of
  1.    10-20
  2.    20-30
  3.    30-40
  4.    60-80
 Discuss Question
Answer: Option C. -> 30-40

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