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MCQs

Total Questions : 46 | Page 4 of 5 pages
Question 31. . Some microorganisms have the ability to increase the nitrogen content of soils, are called as
  1.    nitrogen fixation
  2.    denitrification
  3.    nitrification
  4.    all of these
 Discuss Question
Answer: Option A. -> nitrogen fixation
Question 32. . Which are the main source of biofertilisers?
  1.    Cyanobacteria
  2.    Bacillus
  3.    Streptococcus
  4.    None of these
 Discuss Question
Answer: Option A. -> Cyanobacteria
Question 33. . 
Nitrogen fixation
  1.    changes the free nitrogen (N2) to a form usable by plants
  2.    especially changes nitrogen compounds, mostly amines such as NH2
  3.    both (a) and (b)
  4.    fix the free nitrogen (N2) by which it should not be usable by plants
 Discuss Question
Answer: Option C. -> both (a) and (b)
Question 34. . The organisms responsible for the characteristic musty or earth odor of a freshly plowed field is/are
  1.    Nocardia
  2.    Streptomyces
  3.    Micromonospora
  4.    all of these
 Discuss Question
Answer: Option D. -> all of these
Question 35. .  Denitrification is
  1.    reduction of nitrate (NO3-) to nitrogen gas
  2.    reduction of nitrate to organic nitrogen compounds
  3.    both (a) and (b)
  4.    changing of atmospheric nitrogen (N2) to nitrogen compounds
 Discuss Question
Answer: Option C. -> both (a) and (b)
Question 36. .  The energy value of biogas is typically
  1.    400-700 BTU/ft3
  2.    1,000 BTU/ft3
  3.    1500 BTU/ft3
  4.    more than 5000 BTU/ft3
 Discuss Question
Answer: Option A. -> 400-700 BTU/ft3
Question 37. . Degree of compost maturity can be assesed by
  1.    infrared technique
  2.    germination test
  3.    both (a) and (b)
  4.    none of the above
 Discuss Question
Answer: Option C. -> both (a) and (b)
Question 38. . The diagnostic enzyme for nitrogen-fixing organisms is
  1.    nitrogenase
  2.    nitrate reductase
  3.    nitrate oxidase
  4.    none of these
 Discuss Question
Answer: Option A. -> nitrogenase
Question 39. . Which of the following soil microorganism is involved in the reduction of sulfates to H2S?
  1.    Thiobacillus thiooxidans
  2.    Desulfotomaculum
  3.    Rhodospirillum
  4.    Rhodomicrobium
 Discuss Question
Answer: Option B. -> Desulfotomaculum
Question 40. . The microbial ecosystem of soil includes
  1.    biotic components of soil
  2.    abiotic components of soil
  3.    biotic and abiotic components of soil
  4.    none of the above
 Discuss Question
Answer: Option C. -> biotic and abiotic components of soil

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