Photosynthesis And Respiration(Biochemistry ) Questions and Answers

Question 1. Which of the following is the reduced form of a temporary electron carrier molecule?
  1.    CO2
  2.    FADH2
  3.    NADP+
  4.    ATP
Explanation:-
Answer: Option B. -> FADH2

Question 2. Which one of the following is a product of both cyclic and noncyclic photophosphorylation?
  1.    ATP
  2.    NADPH
  3.    O2
  4.    Carbohydrate
Explanation:-
Answer: Option A. -> ATP

Question 3. NADP+ is reduced to NADPH during
  1.    photorespiration
  2.    light dependent reactions
  3.    none of these
  4.    calvin cylcle
Explanation:-
Answer: Option B. -> light dependent reactions

Question 4. Which of the following represents a correct ordering of the events that occur during the respiration of glucose in the absence of O2?
  1.    Oxidative phosphorylation; citric acid cycle; glycolysis
  2.    Glycolysis; oxidative phosphorylation; citric acid cycle
  3.    Glycolysis; fermentation
  4.    Glycolysis; citric acid cycle; oxidative phosphorylation
Explanation:-
Answer: Option C. -> Glycolysis; fermentation

Question 5. The rate of photorespiration in most plants increases at.higher temperatures. Some plants have evolved a somewhat round-about system to deal with this problem. This series of reactions is called
  1.    Calvin cycle
  2.    Photosystem II
  3.    C4 pathway
  4.    ETS (electron transfer system in light reactions
Explanation:-
Answer: Option C. -> C4 pathway

Question 6. More ATP is manufactured during __________ than at any other time in all of cellular metabolism.
  1.    glycolysis
  2.    the light reactions of photosynthesis
  3.    fermentation
  4.    oxidative phosphorylation
Explanation:-
Answer: Option D. -> oxidative phosphorylation

Question 7. Where does the O2 come from that is essential for the proper functioning of oxidative phosphorylation?
  1.    Light reactions of photosynthesis
  2.    Carbon fixation
  3.    Dark reactions of photosynthesis
  4.    Fermentation
Explanation:-
Answer: Option A. -> Light reactions of photosynthesis

Question 8. Carbon fixation requires the expenditure of ATP molecules which is generated by
  1.    replenishment of chlorophyll
  2.    formation of glucose during the Calvin cycle
  3.    None of these
  4.    ETS (electron transfer system) during the light reactions
Explanation:-
Answer: Option D. -> ETS (electron transfer system) during the light reactions

Question 9. Antenna complexes, electron transport chains, and carbon fixation are all found in
  1.    plant cells
  2.    bacterial cells
  3.    association with the reactions of the citric acid cycle
  4.    animal cells
Explanation:-
Answer: Option A. -> plant cells

Question 10. Electron transport systems play a vital role in
  1.    Calvin cycle
  2.    photorespiration
  3.    light-dependent reactions
  4.    all of these
Explanation:-
Answer: Option C. -> light-dependent reactions