Nitrogen Fixation And Photosynthesis(Biotechnology ) Questions and Answers

Question 1. What type of long chain alcohol is esterified to plant chlorophyll molecules?
  1.    None of these
  2.    Dolichol
  3.    Farnesol
  4.    Phytol
Explanation:-
Answer: Option D. -> Phytol
Question 2. Which of the following bacteria genus is capable of oxidizing ammonia (NH4)?
  1.    Nitrosobacter
  2.    Nitrobacter
  3.    Nitrosococcus
  4.    Nitrospina
Explanation:-
Answer: Option C. -> Nitrosococcus
Question 3. The chief source of nitrogen for green plants is
  1.    low molecular weight- organic nitrogenous compound
  2.    ammonium salts
  3.    atmospheric nitrogen
  4.    nitrates
Explanation:-
Answer: Option D. -> nitrates
Question 4. During nitrogen fixation the enzyme nitrogenase catalyse the reaction. The reaction is high energy demanding which require approximately
  1.    18 ATP
  2.    12 ATP
  3.    25 ATP
  4.    7 ATP
Explanation:-
Answer: Option A. -> 18 ATP
Question 5. A group of about 300 chlorophyll molecule acting together to trap photons and transfer energy to the pigment molecule at the reaction center may be called as
  1.    harvesting unit
  2.    photosynthetic unit
  3.    reaction center
  4.    chloromass
Explanation:-
Answer: Option B. -> photosynthetic unit
Question 6. Which of the following molecule is produced from the fixation of CO2 in C4 plants?
  1.    Alpha-ketoglutarate
  2.    Malate
  3.    Pyruvate
  4.    Oxaloacetate
Explanation:-
Answer: Option D. -> Oxaloacetate
Question 7. In the Calvin cycle of C3 plants, which molecule is the acceptor of CO2?
  1.    Ribose-5-phosphate
  2.    Erythrose-4-phosphate
  3.    Alpha-ketoglutarate
  4.    Ribulose-l,5-diphosphate
Explanation:-
Answer: Option D. -> Ribulose-l,5-diphosphate
Question 8. An organism that relies exclusively on pre-synthesized food molecules is
  1.    autotrophic
  2.    prokaryotic
  3.    heterotrophic
  4.    photosynthetic
Explanation:-
Answer: Option C. -> heterotrophic
Question 9. Plants absorb nitrates from soil and convert them into
  1.    nitrogen
  2.    urea
  3.    ammonia
  4.    none of these
Explanation:-
Answer: Option C. -> ammonia
Question 10. In the presence of carbon monoxide, nitrogen fixation
  1.    none of these
  2.    decreases
  3.    increases
  4.    inhibits
Explanation:-
Answer: Option D. -> inhibits
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