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MCQs

Total Questions : 34 | Page 3 of 4 pages
Question 21.  During nitrogen fixation the enzyme nitrogenase catalyse the reaction. The reaction is high energy demanding which require approximately
  1.    12 ATP
  2.    18 ATP
  3.    25 ATP
  4.    7 ATP
 Discuss Question
Answer: Option B. -> 18 ATP
Question 22.  Plants absorb nitrates from soil and convert them into
  1.    urea
  2.    ammonia
  3.    nitrogen
  4.    none of these
 Discuss Question
Answer: Option B. -> ammonia
Question 23.  Which of the following molecule is produced from the fixation of CO2 in C4 plants?
  1.    Malate
  2.    Oxaloacetate
  3.    Pyruvate
  4.    Alpha-ketoglutarate
 Discuss Question
Answer: Option B. -> Oxaloacetate
Question 24.  An organism that relies exclusively on pre-synthesized food molecules is
  1.    autotrophic
  2.    photosynthetic
  3.    prokaryotic
  4.    heterotrophic
 Discuss Question
Answer: Option D. -> heterotrophic
Question 25. . In the Calvin cycle of C3 plants, which molecule is the acceptor of CO2?
  1.    Erythrose-4-phosphate
  2.    Ribulose-l,5-diphosphate
  3.    Ribose-5-phosphate
  4.    Alpha-ketoglutarate
 Discuss Question
Answer: Option B. -> Ribulose-l,5-diphosphate
Question 26.  In the presence of carbon monoxide, nitrogen fixation
  1.    increases
  2.    decreases
  3.    inhibits
  4.    none of these
 Discuss Question
Answer: Option C. -> inhibits
Question 27. . A major plant macronutrient found in nucleic acids and proteins is
  1.    calcium
  2.    nitrogen
  3.    sulphur
  4.    iron
 Discuss Question
Answer: Option B. -> nitrogen
Question 28. . What is the metal ligand in chlorophylls?
  1.    Copper (Cu)
  2.    Iron (Fe)
  3.    Magnesium (Mg)
  4.    Manganese (Mn)
 Discuss Question
Answer: Option C. -> Magnesium (Mg)
Question 29. . Chlorophyll is associated with
  1.    thylakoids
  2.    stroma
  3.    cristae
  4.    matrix
 Discuss Question
Answer: Option A. -> thylakoids
Question 30. . Nitrosomonous and Nitrobacter obtain their carbon for growth from
  1.    organic compounds
  2.    carbon dioxide
  3.    elementary carbon
  4.    none of these
 Discuss Question
Answer: Option B. -> carbon dioxide

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