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MCQs

Total Questions : 186 | Page 11 of 19 pages
Question 101. 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
Answer: (a).mold mycelium
Question 102. In the process of nitrogen fixation, which of the following microorganism is involved?
  1.    Non symbiotic microorganisms only
  2.    Symbiotic microorganisms only
  3.    Non symbiotic and symbiotic microorganisms only
  4.    None of the above
 Discuss Question
Answer: Option C. -> Non symbiotic and symbiotic microorganisms only
Answer: (c).Non symbiotic and symbiotic microorganisms only
Question 103. __________ 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
Answer: (a).Cyanobacteia
Question 104. Which of the following comes under the category of positive association?
  1.    neutralism
  2.    parasitism
  3.    commensalism
  4.    ammensalism
 Discuss Question
Answer: Option C. -> commensalism
Answer: (c).commensalism
Question 105. Parasitism results from competition among organisms for essential nutrients.
  1.    True
  2.    False
  3.    May be
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 106. Bacteria are likely to be more prevalent in soils of vineyards, orchards and apiaries.
  1.    True
  2.    False
  3.    May be
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 107. The dominant mineral particles in most soils are compounds of _____________
  1.    sodium
  2.    potassium
  3.    magnesium
  4.    iron
 Discuss Question
Answer: Option D. -> iron
Answer: (d).iron
Question 108. Which of the following organisms are known to grow on the surfaces of freshly exposed rocks?
  1.    green algae
  2.    diatoms
  3.    cyanobacteria
  4.    yeast
 Discuss Question
Answer: Option C. -> cyanobacteria
Answer: (c).cyanobacteria
Question 109. 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)
Answer: (c).both (a) and (b)
Question 110. 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)
Answer: (c).both (a) and (b)

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