Class 11 Biology Chapter 14 Respiration in Plants MCQ Questions with Answer

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Respiration in Plants Class 11 MCQ Questions with Answer

Class 11 Biology MCQ with answers are given here to chapter 14 Respiration in Plants. These MCQs are based on the latest CBSE board syllabus and relate to the latest Class 11 BIology syllabus. By Solving these Class 11 MCQs, you will be able to analyze all of the concepts quickly in the chapter and get ready for the Class 11 Annual exam.

Learn Class 11 Respiration in Plants MCQs with answers pdf free download according to the latest CBSE and NCERT syllabus. Students should prepare for the examination by solving CBSE Class 11 Biology Respiration in Plants MCQ with answers given below

Question 1. Which of the metabolites is common to respiration mediated breakdown of fats, carbohydrates and proteins? 
(a) Fructose 1, 6 – bisphosphate
(b) Pyruvic acid
(c) Acetyl CoA
(d) Glucose – 6 – phosphate

Question 2. Conversion of glucose to glucose-6-phosphate, the first irreversible reaction of glycolysis, is catalysed by 
(a) phosphofructokinase
(b) aldolase
(c) hexokinase
(d) enolase.

Question 3. An enzymes of TCA cycle are located in themitochondrial matrix except one which is located in inner mitochondrial membrane in eukaryotes and in cytosol in prokaryotes. This enzyme is   
(a) Succinate dehydrogenase
(b) Lactate dehydrogenase
(c) Isocitrate dehydrogenase
(d) Malate dehydrogenase

Question 4. At the end of glycolysis, six carbon compound   
ultimately changes into
(a) ethyl alcohol
(b) acetyl Co-A
(c) pyruvic acid
(d) ATP.

Question 5. What is the role of NAD+ in cellular respiration?   
(a) It functions as an enzyme.
(b) It functions as an electron carrier.
(c) It is a nucleotide source for ATP synthesis.
(d) It is the final electron acceptor for anaerobic respiration.

Question 6. In glycolysis, during oxidation electrons are removed by   
(a) ATP
(b) glyceraldehyde-3-phosphate
(c) NAD+
(d) molecular oxygen.

Question 7. In which one of the following processes CO₂ is not released?   
(a) Aerobic respiration in plants
(b) Aerobic respiration in animals
(c) Alcoholic fermentation
(d) Lactate fermentation 

Question 8. The first phase in the breakdown of glucose, in animal cell, is 
(a) fermentation
(b) Krebs’ cycle
(c) glycolysis
(d) ETS.

Question 9. End product of glycolysis is   
(a) acetyl CoA
(b) pyruvic acid
(c) glucose 1-phosphate
(d) fructose 1-phosphate.

Question 10. The energy-releasing metabolic process in which substrate is oxidised without an external electron acceptor is called 
(a) glycolysis
(b) fermentation
(c) aerobic respiration
(d) photorespiration.

Question 11. Which of the following is the connecting link between glycolysis and Krebs cycle? 
(a) Acetyl CoA
(b) Oxalosuccinic acid
(c) Pyruvic acid
(d) Citric acid

Question 12. Pyruvate kinase enzyme catalyses   
(a) first irreversible step of glycolysis
(b) second irreversible step of glycolysis
(c) third irreversible step of glycolysis
(d) fourth irreversible step of glycolysis

Question 13. Which of the following products are obtained by anaerobic respiration from yeast?   
(a) Beer and wine
(b) Alcohols
(c) CO2
(d) All of these

Question 14. In alcohol fermentation   
(a) triose phosphate is the electron donor while acetaldehyde is the electron acceptor
(b) triose phosphate is the electron donor while pyruvic acid is the electron acceptor
(c) there is no electron donor
(d) oxygen is the electron acceptor.

Question 15. The end product of fermentation are   
(a) O2 and C2H5OH
(b) CO2 and acetaldehyde
(c) CO2 and O2
(d) CO2 and C2H5OH.

Question 16. Where is respiratory electron transport system (ETS) located in plants ?   
(a) Mitochondrial matrix
(b) Outer mitochondrial membrane
(c) Inner mitochondrial membrane
(d) Intermembrane space 

Question 17. When yeast ferments glucose, the products obtained are   
(a) ethanol and CO2
(b) methanol and CO2
(c) ethanol and water
(d) water and CO2.

Question 18. The number of substrate level phosphorylations in one turn of citric acid cycle is 
(a) zero
(b) one
(c) two
(d) three.

Question 19. Oxidative phosphorylation is   
(a) formation of ATP by transfer of phosphate
group from a substrate to ADP
(b) oxidation of phosphate group in ATP
(c) addition of phosphate group to ATP
(d) formation of ATP by energy released from electrons removed during substrate oxidation.

Question 20. Which of these statements is incorrect?   
(a) Enzymes of TCA cycle are present in mitochondrial matrix.
(b) Glycolysis occurs in cytosol.
(c) Glycolysis operates as long as it is supplied with NAD that can pick up hydrogen atoms.
(d) Oxidative phosphorylation takes place in outer mitochondrial membrane.

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Question 21. Which statement is wrong for Krebs’ cycle?   
(a) There is one point in the cycle where FAD+ is reduced to FADH2.
(b) During conversion of succinyl CoA to succinic acid, a molecule of GTP is synthesised.
(c) The cycle starts with condensation of acetyl group (acetyl CoA) with pyruvic acid to yield citric acid.
(d) There are three points in the cycle where NAD+is reduced to NADH + H+.

Question 22. All enzymes of TCA cycle are located in the mitochondrial matrix except one which is located in inner mitochondrial membranes in eukaryotes and in cytosol in prokaryotes. This enzyme is 
(a) isocitrate dehydrogenase
(b) malate dehydrogenase
(c) succinate dehydrogenase
(d) lactate dehydrogenase.

Question 23. Cytochromes are found in   
(a) cristae of mitochondria
(b) lysosomes
(c) matrix of mitochondria
(d) outer wall of mitochondria. 

Question 24. In mitochondria, protons accumulate in the   
(a) outer membrane
(b) inner membrane
(c) intermembrane space
(d) matrix.

Question 25. Which one of the following statements about cytochrome P450 is wrong? 
(a) It is a coloured cell.
(b) It is an enzyme involved in oxidation reactions.
(c) It has an important role in metabolism.
(d) It contains iron.

Question 26. In which one of the following do the two names refer to one and the same thing ?   
(a) Krebs’ cycle and Calvin cycle
(b) Tricarboxylic acid cycle and citric acid cycle
(c) Citric acid cycle and Calvin cycle
(d) Tricarboxylic acid cycle and urea cycle

Question 27. Cytochrome is 
(a) metallo flavo protein
(b) Fe containing porphyrin pigment
(c) glycoprotein
(d) lipid.

Question 28. In alcoholic fermentation, NAD+ is produced during the   
(a) reduction of acetyldehyde to ethanol.
(b) oxidation of glucose.
(c) oxidation of pyruvate to acetyl coA.
(d) hydrolysis of ATP to ADP

Question 29. Which of the following is the key intermediate compound linking glycolysis to the Krebs’ cycle? 
(a) Malic acid
(b) Acetyl CoA
(c) NADH
(d) ATP

Question 30. By which of the following complex, proton is pumped to reach ATP synthase to participate in ATP synthesis?   
(a) Cytochrome b6f
(b) Cytochrome c oxidase
(c) Cytochrome a – a3
(d) Cytochrome bc

Question 31. The 1992 Nobel Prize for medicine was awarded to Edmond H. Fischer and Edwin J. Krebs for their work concerning   
(a) reversible protein phosphorylation as a biological regulation mechanism
(b) isolation of the gene for a human disease
(c) human genome project
(d) drug designing involving inhibition of DNA synthesis of the pathogen.

Question 32. In Krebs’ cycle, the FAD precipitates as electron acceptor during the conversion of   
(a) fumaric acid to malic acid
(b) succinic acid to fumaric acid
(c) succinyl CoA to succinic acid
(d) α-ketoglutarate to succinyl CoA.

Question 33. The correct sequence of electron acceptor in ATP synthesis is   
(a) Cyt. b, c, a3, a
(b) Cyt. c, b, a, a3
(c) Cyt. a, a, b, c
(d) Cyt. b, c, a, a3.

Question 34. End products of aerobic respiration are    
(a) sugar and oxygen
(b) water and energy
(c) carbon dioxide, water and energy
(d) carbon dioxide and energy.

Question 35. Terminal cytochrome of respiratory chain which donates electrons to oxygen is   
(a) Cyt b
(b) Cyt c
(c) Cyt a1
(d) Cyt a3.

Question 36. End product of citric acid cycle/Krebs’ cycle is   
(a) citric acid
(b) lactic acid
(c) pyruvic acid
(d) CO2 + H2O.

Question 37. Oxidative phosphorylation is production of   
(a) ATP in photosynthesis
(b) NADPH in photosynthesis
(c) ATP in respiration
(d) NADH in respiration.

Question 38. In glycolysis, glucose molecule is converted into   
(a) PEP
(b) RuBP
(c) acetyl CoA
(d) pyruvic acid

Question 39. Connecting link between glycolysis and Krebs’ cycle before pyruvate entering Krebs’ cycle is changed to 
(a) oxaloacetate
(b) PEP
(c) pyruvate
(d) acetyl CoA.

Question 40. Glycolysis occurs in   
(a) mitochondria
(b) chloroplast
(c) cytoplasm
(d) peroxisome

Question 41. Anaerobic respiration, after glycolysis is also   
called as
(a) fermentation
(b) fragmentation
(c) restoration
(d) multiplication

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