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Respiration in Plants Test - 27

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Respiration in Plants Test - 27
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Weekly Quiz Competition
  • Question 1
    1 / -0
    In which one of the following, the two names refer to one and the same thing?
    Solution
    Correct option: C
    Explanation: 

    • Tricarboxylic acid cycle is the same as the citric acid cycle. It is also known as the Krebs cycle. It is called so as the first compound formed is citric acid which is a tricarboxylic acid with carboxyl groups.
    • Calvin cycle refers to the enzymatic reaction that fixes carbon dioxide into carbohydrates. Series of reactions that produce urea from ammonia are collectively termed the urea cycle.
  • Question 2
    1 / -0
    In Krebs cycle the FAD participates as electron acceptor during the conversion of 
    Solution
    In Krebs cycle the FAD participates as electron acceptor during the conversion of succinic acid to fumaric acid. Then the FAD is converted to $$FADH_2$$.

  • Question 3
    1 / -0
    Choose the correct combination of labelling the number of carbon compounds in the substrate molecules, involved in the citric acid cycle.

    Solution
    Number of carbon compounds in the substrate molecules of citric acid cycle are:- oxalo acetic acid- 4 , citric acid- 6, alpha-ketoglutaric acid- 5, succinic acid- 4 and malic acid- 4.
    So, the correct answer is '(A)4C, (B)6C, (C)5C, (D)4C, (E)4C'
  • Question 4
    1 / -0
    Cytochromes occur in 
    Solution
    • Cytochromes are iron-containing hemeproteins which is associated with the inner membrane of the mitochondria. They are primarily responsible for the generation of ATP via electron transport. 
    • The different cytochromes are in various places of the ETC, but each one has a basic role: transferring electrons. 

    Hence option D is correct.
  • Question 5
    1 / -0
    The importance of Krebs cycle is in the production of 
    Solution
    Krebs cycle is a step in aerobic respiration, where ATP molecules are generated in large number. This cycle consumes acetate and water, reduces $$NAD^+$$ to NADH, and produces carbon dioxide as a waste product. The NADH generated by the cycle is fed into the oxidative phosphorylation pathway. The net result of these two closely linked pathways is the oxidation of nutrients to produce usable chemical energy in the form of ATP.
  • Question 6
    1 / -0
    Which of the following is produced during Krebs cycle?
    Solution
    Citric acid is produced during Krebs cycle. Because of that reason it is also called as citric acid cycle. It is the first product of Krebs cycle.

  • Question 7
    1 / -0
    Which one of the following energy storing compound is formed when succinyl CoA is converted into succinic acid?
    Solution
    When succinyl CoA is converted to succinic acid GTP molecules are produced and the coenzyme part is released. This reaction is done in presence of succinyl-CoA synthetase.

  • Question 8
    1 / -0
    The pyruvic acid formed in glycolysis is oxidized to C$$O_{2}$$ and H$$_{2}$$O in a cycle called as
    Solution
    The pyruvic acid formed during glycolysis enters into a cycle of events called Krebs cycle where it is oxidised to form carbon dioxide and water. It forms the aerobic pathway of respiration. 
  • Question 9
    1 / -0
    Which of the following are X, Y and Z in the given schematic diagram?

    Solution
    • Glycolysis is the breakdown of complex carbohydrates into the simpler form, i.e., pyruvic acid. Thus, X represents glycolysis. 
    • In the absence of oxygen pyruvic acid further converts into alcohol and carbon dioxide with a lesser amount of energy i.e., fermentation or anaerobic respiration or anoxybiotic. Thus, Z represents anoxybiotic. 
    • In the presence of oxygen (aerobic respiration), pyruvic acid will be converted into carbon dioxide, water, and a large amount of energy. Aerobic respiration is also known as oxybiotic respiration. Thus, Y represents oxybiotic. 

    Hence, the correct answer is option C.
  • Question 10
    1 / -0
    The energy-releasing metabolic process in which substrate is oxidised without an external electron acceptor is called
    Solution
    In Fermentation, the ATP are generated only during the glycolysis. In order to make sure that the glycolysis continues to occur, the electron acceptor called NAD is required to be supplied constantly. Therefore, in fermentation process, the regeneration of these NAD occurs which now exists in the form of NADH (after accepting electron in glycolysis). Since, there is no usage of oxygen, there is no external electron acceptor. Oxygen acts as electron acceptor in aerobic respiration during the electron transport chain. In fermentation, either the pyruvate or the acetaldehyde , which have been formed internally in the process. 
    Hence, the correct answer is 'Fermentation'
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