Quiz  /  Respiration in Plants Class 11 MCQ Questions With Answers

  • 1. 
    Fermentation always produces –

  • AMP
  • NAD+
  • Pi
  • DNA

  • 2. 
    What is the role of NAD+ in cellular respiration?

  • It is a nucleotide source for ATP synthesis.
  • It functions as an electron carrier.
  • It functions as an enzyme
  • It is the final electron acceptor for anaerobic respiration.

  • 3. 
    How many ATP molecules are formed from three molecules of acetyl CoA in Krebs cycle excluding electron transport chain?

  • 5
  • 3
  • 6
  • 33

  • 4. 
    Pyruvate which is formed by the glycolytic catabolism of carbohydrates in the cytosol, after it enters into mitochondrial matrix it undergoes :

  • Reductive amination
  • Oxidation decarboxylation
  • Reductive carboxylation
  • Reductive decarboxylation

  • 5. 
    Glycolysis is found in –

  • Eukaryotic cells
  • Anaerobic cells
  • Virtually all cells
  • Most muscle cells

  • 6. 
    Which of the following enzymes involved in Kreb’s cycle is not present in the mitochondrial matrix?

  • Aconitase
  • Malate dehydrogenase
  • Fumarase
  • Succinate dehydrogenase

  • 7. 
    Conversion of glucose to glucose-6-phosphate, the first irreversible reaction of glycolysis, is catalyzed by

  • Aldolase
  • Hexokinase
  • Enolase
  • Phosphofructokinase

  • 8. 
    In Kreb’s cycle, how many oxidation (dehydrogenation) occur?

  • 4
  • 6
  • 2
  • 1

  • 9. 
    How many oxidation step take place during glycolysis, link reaction and Kreb’s cycle.

  • 1, 1 and 1
  • 1, 1 and 4
  • 1, 1 and 3
  • 1, 1 and 8

  • 10. 
    When a molecule of pyruvic acid is subjected to fermentation and forms lactic acid, there is

  • Gain of 2 ATP
  • Loss of 3 ATP
  • Loss of 6 ATP
  • Gain of 3 ATP

  • 11. 
    Correct sequence of events in Kreb’s cycle is –

  • Acetyl CoA →Citrate →Pyruvate →α -ketoglutarate →Succinate →Malate→ Fumarate→ OAA
  • Acetyl CoA →Citric acid→α -ketoglutaric acid →Succinic acid →Fumaric acid→ Malic acid→ OAA
  • Acetyl CoA →Citric acid →Malic acid →α-ketoglutaric acid →Succinic acid →OAA
  • All are wrong

  • 12. 
    Which of these statements is incorrect?

  • Glycolysis operates as long as it is supplied with NAD that can pick up hydrogen atoms
  • Glycolysis occurs in cytosol
  • Enzymes of TCA cycle are present in mitochondrial matrix
  • Oxidative phosphorylation takes place in outer mitochondrial membrane

  • 13. 
    Function of respiration is to –

  • make ATP
  • Make NADH
  • Get rid of glucose
  • Get rid of CO2

  • 14. 
    Which statement is wrong for Krebs' cycle ?

  • There is one point in the cycle where FAD+ is reduced to FADH2
  • During conversion of succinyl CoA to succinic acid, a molecule of GTP is synthesised
  • The cycle starts with condensation of acetyl group (acetyl CoA) with pyruvic acid to yield citric acid
  • There are three points in the cycle where NAD+ is reduced to NADH + H+

  • 15. 
    Electrons from NADH produced in the mitochondrial matrix during citric acid cycle are oxidised by :–

  • Complex II
  • Complex III
  • Complex I
  • Complex IV

  • 16. 
    NAD+ is –

  • a protein
  • an oxidising agent
  • a reducing agent
  • formed under only aerobic conditions

  • 17. 
    Which one of the following is the only 5-carbon compound formed during Krebs’ cycle?

  • Malic acid
  • Succinic acid
  • Cis-aconitic acid
  • α\alphaα -ketoglutaric acid

  • 18. 
    How many molecules of O2 are used and how many CO2 comes out during the glycolytic breakdown of one glucose molecule?

  • 1; 2
  • 2; 1
  • 0; 0
  • 36; 6

  • 19. 
    Cytochromes are found in

  • Cristae of mitochondria
  • Lysosomes
  • Matrix of mitochondria
  • Outer wall of mitochondria

  • 20. 
    Which is required in glycolysis

  • ATP, ADP, NAD+, Glucose, cytoplasmic enzymes
  • FAD+, ADP, ATP, Glucose, cytoplasmic enzymes
  • NADP+, ATP, GTP, Glucose, cytoplasmic enzymes
  • NAD+, NADP+, ATP, Glucose, cytoplasmic enzymes

  • 21. 
    First respiratory substrate :

  • Lipid
  • Protein
  • Carbohydrate
  • Both (a) and (c)
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