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MCQs

Total Questions : 186 | Page 18 of 19 pages
Question 171. Which of the following species of different genera of bacteria are not capable of transforming nitrate to nitrogen?
  1.    Agrobacterium
  2.    Achromobacter
  3.    None of these
  4.    Alcaligenes
 Discuss Question
Answer: Option C. -> None of these
Question 172. Nitrogen fixation
  1.    changes the free nitrogen (N2) to a form usable by plants
  2.    both (a) and (b)
  3.    fix the free nitrogen (N2) by which it should not be usable by plants
  4.    especially changes nitrogen compounds, mostly amines such as NH2
 Discuss Question
Answer: Option B. -> both (a) and (b)
Question 173. The breakdown of cattle manure in biogas is accomplished by which of the following type of bacteria?
  1.    All of these
  2.    Transitional
  3.    methanogenic
  4.    Hydrolytic
 Discuss Question
Answer: Option A. -> All of these
Question 174. For rapid decomposition by microbes, the substrate should have a C/N ratio of
  1.    20-30
  2.    10-20
  3.    60-80
  4.    30-40
 Discuss Question
Answer: Option D. -> 30-40
Question 175. Degree of compost maturity can be assesed by
  1.    None of these
  2.    germination test
  3.    infrared technique
  4.    both (a) and (b)
 Discuss Question
Answer: Option D. -> both (a) and (b)
Question 176. Which are the main source of biofertilisers?
  1.    None of these
  2.    Bacillus
  3.    Cyanobacteria
  4.    Streptococcus
 Discuss Question
Answer: Option C. -> Cyanobacteria
Question 177. Denitrification is
  1.    reduction of nitrate to organic nitrogen compounds
  2.    both (a) and (b)
  3.    reduction of nitrate (NO3-) to nitrogen gas
  4.    changing of atmospheric nitrogen (N2) to nitrogen compounds
 Discuss Question
Answer: Option B. -> both (a) and (b)
Question 178. The organisms responsible for the characteristic musty or earth odor of a freshly plowed field is/are
  1.    Streptomyces
  2.    all of these
  3.    Nocardia
  4.    Micromonospora
 Discuss Question
Answer: Option B. -> all of these
Question 179. Which of the following soil microorganism is involved in the reduction of sulfates to H2S?
  1.    Rhodomicrobium
  2.    Desulfotomaculum
  3.    Rhodospirillum
  4.    Thiobacillus thiooxidans
 Discuss Question
Answer: Option B. -> Desulfotomaculum
Question 180. The diagnostic enzyme for nitrogen-fixing organisms is
  1.    nitrate oxidase
  2.    nitrogenase
  3.    nitrate reductase
  4.    none of these
 Discuss Question
Answer: Option B. -> nitrogenase

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