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MCQs

Total Questions : 186 | Page 17 of 19 pages
Question 161. The physical structure of soil is improved by the accumulation of
  1.    mold mycelium
  2.    water
  3.    all of these
  4.    minerals
 Discuss Question
Answer: Option A. -> mold mycelium
Question 162. In the process of nitrogen fixation, which of the following microorganism is involved?
  1.    Non symbiotic microorganisms only
  2.    Non symbiotic and symbiotic microorganisms only
  3.    None of these
  4.    Symbiotic microorganisms only
 Discuss Question
Answer: Option B. -> Non symbiotic and symbiotic microorganisms only
Question 163. Which of the following statement is not true about composition of biogas?
  1.    It is composed almost exclusively of methane and carbon dioxide
  2.    Both (a) and (b)
  3.    It also contains with traces of H2S, N2, H2and CO
  4.    It also contains with traces of O2 and Cl2
 Discuss Question
Answer: Option D. -> It also contains with traces of O2 and Cl2
Question 164. The crops which are involved in nitrogen fixation are
  1.    all of these
  2.    soybean
  3.    alfalfa and clover
  4.    bean and lupine
 Discuss Question
Answer: Option A. -> all of these
Question 165. The nitrogenase consists of
  1.    both (a) and (b)
  2.    dinitrogenase
  3.    none of these
  4.    dinitrogenase reductase
 Discuss Question
Answer: Option A. -> both (a) and (b)
Question 166. Denitrification may be distinguished as
  1.    assimilative
  2.    dissimilative
  3.    both (a) and (b)
  4.    blue baby syndrome
 Discuss Question
Answer: Option C. -> both (a) and (b)
Question 167. The groups of bacteria which have the ability to fix nitrogen from air to soil are
  1.    none of these
  2.    both (a) and (b)
  3.    symbiotic
  4.    nonsymbiotic
 Discuss Question
Answer: Option B. -> both (a) and (b)
Question 168. __________ play a key role in the transformation of rock to soil.
  1.    De-nitrifying bacteria
  2.    Cyanobacteia
  3.    Nitrifying bacteria
  4.    Pectin decomposing bacteria
 Discuss Question
Answer: Option B. -> Cyanobacteia
Question 169. The conversion of molecular nitrogen into ammonia is known as
  1.    ammonification
  2.    denitrification
  3.    nitrification
  4.    nitrogen fixation
 Discuss Question
Answer: Option D. -> nitrogen fixation
Question 170. Some microorganisms have the ability to increase the nitrogen content of soils, are called as
  1.    nitrification
  2.    all of these
  3.    denitrification
  4.    nitrogen fixation
 Discuss Question
Answer: Option D. -> nitrogen fixation

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