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Respiration in Plants Test - 43

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Respiration in Plants Test - 43
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  • Question 1
    1 / -0
    The energy releasing process in which the substrate is oxidised without an external electron acceptor is called as 
    Solution
    Fermentation is an anaerobic pathway which takes place in certain bacteria and fungi which do not involve electron transport chain. In this process, substrate level phosphorylation takes place in glycolysis producing 2 ATP molecules. 
  • Question 2
    1 / -0
    The membrane-bound enzyme that is involved in Krebs cycle occurring in mitochondria is
    Solution
    Malate dehydrogenase is the membrane bound enzyme involved in Krebs cycle. This enzyme catalyses the conversion of malate into oxaloacetate and vice versa and is a reversible reaction. During the Krebs cycle, pyruvate present in the mitochondria is acted upon by pyruvate carboxylase to form oxaloacetate. In order to get the oxaloacetate out of the mitochondria, the enzyme malate dehydrogenase reduces it to malate and traverses through the inner mitochondrial membrane.
    Therefore, the correct answer is option C.
  • Question 3
    1 / -0
    Glucose is oxidised to ethyl alcohol during the process of
    Solution
    The process of anaerobic respiration takes place in the absence of oxygen. In this type, glucose is oxidized to ethyl alcohol, and it releases carbon dioxide. For example, breathing in yeast is a type of anaerobic respiration.
    So, option C is the correct answer.
  • Question 4
    1 / -0
    The rubber we obtain from rubber plants is
  • Question 5
    1 / -0
    Krebs cycle begins with
    Solution
    The Krebs cycle occurs in the mitochondria of a cell and it's an important part in generating energy or ATP molecules. The Krebs cycle occurs right after glycolysis. The substance that begins the Krebs cycle is a 3-carbon molecule called pyruvic acid. The process breaks down the pyruvic acid into acetyl coenzyme A, releasing one of the carbon atoms into carbon dioxide. 
    Therefore, the correct answer is option B.
  • Question 6
    1 / -0
    The first product of Krebs cycle is
    Solution
    The Krebs cycle which takes place in the mitochondria of the cell helps in generating energy and occurs immediately after glycolysis. The cycle which starts with the 3- carbon molecule called pyruvic acid, breaks it down into acetyl coenzyme A which then further combines with oxalo acetic acid to form citric acid. Krebs cycle is also referred to as citric acid cycle.
    Therefore, the correct answer is option B.
  • Question 7
    1 / -0
    In respiration, pyruvic acid is
    Solution

    Solution

    Correct answer is option A.

    Explanation for correct option:

    • Aerobic respiration includes three stages glycolysis, Krebs cycle, and oxidative phosphorylation.
    • The glycolysis is a ten-step process in which glucose is converted into the molecule pyruvate.
    • The pyruvate is converted into the acetyl-CoA in the intermediate step of cellular respiration.
    • In a single turn of the TCA cycle, two carbons enter from acetyl CoA, and two molecules of carbon dioxide are released. 

  • Question 8
    1 / -0
    R.Q. is measured by
    Solution
    Respiratory quotient is defined as volume of carbon dioxide released to the volume of oxygen absorbed during the process of cellular respiration. A respirometer is a device used to measure the rate of respiration of a living organism by measuring its rate of exchange of oxygen and/or carbon dioxide. 
  • Question 9
    1 / -0
    Acetylation of pyruvate takes place in the 
    Solution
    Pyruvic acid produced during glycolysis undergoes acetylation in the mitochondrial matrix to form acetyl CoA. In this process, oxidative decarboxylation takes place in the presence of enzyme pyruvic dehydrogenase. 

  • Question 10
    1 / -0
    Decarboxylation is involved in the
    Solution
    Decarboxylation is a chemical reaction that removes a carboxyl group and releases carbon dioxide. Pyruvate molecules are produced during glycolysis. Each puruvate produces acetyl CoA molecule and releases carbon dioxide. Kreb's cycle produces 2 carbon dioxide molecules during decarboxylation process. The first decarboxylation results in formation of alpha-ketoglutaric acid and and other decarboxylation results in formation of succinic acid respectively. 
    Thus, the correct answer is 'Krebs cycle.'

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