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MCQs

Total Questions : 186 | Page 12 of 19 pages
Question 111. 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
Answer: (c).nitrogen fixation
Question 112. 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)
Answer: (c).both (a) and (b)
Question 113. 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
Answer: (d).all of these
Question 114. 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
Answer: (c).biotic and abiotic components of soil
Question 115. 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
Answer: (b).Desulfotomaculum
Question 116. 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
Answer: (a).nitrogenase
Question 117. Which of the following fungi on infecting crop roots can improve their uptake of phosphorus and other nutrients?
  1.    Saccharomyces cerevisiae
  2.    VA Mycorrhiza
  3.    Candida torulopsis
  4.    Aspergillus niger
 Discuss Question
Answer: Option B. -> VA Mycorrhiza
Answer: (b).VA Mycorrhiza
Question 118. Denitrification is carried out
  1.    usually by facultative anaerobes
  2.    predominantly by Pseudomonas spp
  3.    predominantly by Bacillus spp
  4.    all of the above
 Discuss Question
Answer: Option D. -> all of the above
Answer: (d).all of the above
Question 119. Marinated (sour pickled) fish should not have spoilage problems unless
  1.    the acid content is very high
  2.    the acid content is low enough
  3.    the acid content is moderate
  4.    none of the above
 Discuss Question
Answer: Option B. -> the acid content is low enough
Answer: (b).the acid content is low enough
Question 120. The predominant kind of bacteria causing spoilage in fish at chilling temperature is
  1.    species of Pseudomonas
  2.    Micrococcus
  3.    Bacillus
  4.    none of these
 Discuss Question
Answer: Option A. -> species of Pseudomonas
Answer: (a).species of Pseudomonas

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