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Respiration in Plants Test - 11

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Respiration in Plants Test - 11
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  • Question 1
    1 / -0
    Krebs' cycle takes place in
    Solution
    Kreb's cycle takes place in the mitochondrial matrix. The pyruvate formed by the reduction of glucose in the glycolysis is broken into acetyl-CoA which enters the Kreb's cycle and condenses with oxaloacetate to form citrate. One pyruvate molecules produce 15 ATP and two pyruvate molecules lead to the production of 30 ATP.
    So, the correct answer is option D.
  • Question 2
    1 / -0
    In which part of the mitochondria does the Krebs cycle take place? 
    Solution
    The Krebs cycle is also known as citric acid cycle or tricarboxylic acid (TCA) cycle. This cycle involves series of reactions in which the energy is released by the break down of the molecules like carbohydrates, proteins and fats. The energy is released in the form of ATP. The reaction of this cycle is carried out in the mitochondrial matrix. The enzymes for this pathway are present in the matrix of the mitochondria. 
    Thus, the correct answer is option D. 

  • Question 3
    1 / -0
    An initial reactant and final product of the Krebs cycle is
    Solution
    During the first step of Krebs cycle, oxalo acetic acid reacts with acetyl CoA to form citric acid. As Krebs cycle is a cyclic pathway, the initial reactant oxalo acetic acid also acts as final product of the cycle. 
  • Question 4
    1 / -0
    All of the following are products of the Krebs cycle, except
    Solution
    Krebs cycle was discovered by Sir Hans Krebs. It is also called as the citric acid cycle because citric acid is the first product of this cycle. In eukaryotic organisms, Krebs cycle takes place in the matrix of mitochondrion because enzymes of this cycle are found in matrix except for succinic dehydrogenase which is located in the inner membrane of the mitochondrion. In prokaryotes, Krebs cycle occurs in the cytoplasm. 
    Krebs cycle is basically a catabolic reaction as it oxidizes acetyl Co-A and organic acids into C‎O2 and H2O. One molecule of pyruvic acid after entering into mitochondrion undergoes three decarboxylation and five oxidation steps. On oxidation, one molecule of pyruvic acid through Krebs cycle yields 15 ATP. Krebs cycle involves eight steps to oxidise two molecules of acetyl Co-A produced in transition reaction completely into 4C‎O2, 10H2O , 2ATP, 2FADH2 and 6NADH + H+. Hence C6H12O6 is not the product of Krebs cycle.
    So, the correct answer is 'C6H12O6'.

  • Question 5
    1 / -0
    Which of the following is true for TCA cycle in eukaryotes?
    Solution
    The cyclic process through which acetyl co A is oxidized to form carbon dioxide and NADH$$_2$$ and FADH$$_2$$ (not ATP directly ) is known as Kreb cycle or  TCA cycle. As it takes place in mitochondria matrix it is also known as the mitochondrial cycle. Thus, the correct answer is option  A.
  • Question 6
    1 / -0
    Ethyl alcohol or lactic acid is produced by the process of
  • Question 7
    1 / -0
    Common phase in aerobic and anaerobic respiration is
    Solution

     

    Correct option: B

    Explanation:

    • Our body requires energy to do many different things such as muscle contractions, transmitted nerve impulses growth, protein synthesis, active transport, maintaining constant body temperature all of this is required as a chemical called ATP. 

    • This is provided by a process called respiration and this happens inside animal cells as well as plant cells in little organelles called mitochondria. 

    • Glucose is provided by food and oxygen is provided through breathing and the whole series of complex chemical reactions take place but the result is carbon dioxide and water are products in that process energy is released and this process is specifically known as aerobic respiration.

    • In the absence of oxygen, glucose will be converted to lactic acid and in the process, it will release a very small amount of energy this process is known as anaerobic respiration.

    • Glycolysis is a process that converts glucose to pyruvic acid.

    Hence, ‘glycolysis’ is the most common phase. 

  • Question 8
    1 / -0
    Phosphorylation of glucose with the help of ATP and hexokinase produces
    Solution
    The mechanism of respiration is initiated by breaking down of glucose to pyruvic acid without the help of oxygen. The initial process occurs in the cytosol of cells which requires glucose as well as ATP molecules which provide energy for the process to start. The first step of glycolytic pathway involves the phosphorylation of glucose in the presence of ATP to form glucose-6-phosphate. The reaction is catalyzed by enzyme hexokinase which requires a divalent magnesium ion as a cofactor. ATP is converted into ADP in this reaction. 
    Thus, the correct answer is option B. 

  • Question 9
    1 / -0
    Number of oxygen molecules required for glycolytic breakdown of one glucose molecule is
    Solution
    Glycolysis forms the first step of aerobic respiration in which glucose is broken down anaerobically to form two molecules of pyruvic acid. It is a 10 step process which takes place in the cytoplasm of cells and all the steps are controlled by the enzyme. Since it does not require oxygen and is anaerobic, so no oxygen molecules are required in it. 
    Thus, the correct answer is option A. 

  • Question 10
    1 / -0
    The most common respiratory substrate is
    Solution
    The various organic substances such as carbohydrates, fats and proteins are respired completely to carbon dioxide and water are called respiratory substrates. Under natural conditions only carbohydrates are used. Glucose being the simplest monosaccharide hexose molecule acts as the chief respiratory substrate. 
    Thus, the correct answer is option A. 
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