Class 11 Biology MCQ Chapter 12 Respiration in Plants
Are you searching for Class 11 Biology MCQ Chapter 12 Respiration in Plants English Medium? If yes, then this article is a great resource for your exam preparation. Here, you will find important multiple-choice questions (MCQs) with answers specially designed for AHSEC Higher Secondary First Year students.
The chapter Respiration in Plants helps students understand how plants release energy from food to carry out various life processes. It covers important topics such as glycolysis, aerobic respiration, anaerobic respiration, Krebs cycle, electron transport system (ETS), ATP production, and respiratory quotient (RQ). These concepts are essential for understanding plant metabolism and energy flow in living organisms.
All MCQs are prepared according to the latest AHSEC syllabus and examination pattern. By practicing these objective questions, students can revise important topics quickly, improve conceptual understanding, and become more confident before examinations.
Whether you are preparing for class tests, annual examinations, or the AHSEC HS First Year Final Exam, these MCQ questions and answers will help you strengthen your Biology preparation and achieve better results.
Unit IV. Plant Physiology
Respiration in Plants
VSA & MCQ
I. Short Answer Questions (1 Mark Each)
Q1. What is respiration?
Ans: Respiration is a biochemical process in which organic substances are oxidised to release energy in the form of ATP.
Q2. What are respiratory substrates?
Ans: These are organic compounds that are oxidised during respiration to release energy.
Q3. What is the most common respiratory substrate?
Ans: Glucose.
Q4. Where does glycolysis occur?
Ans: In the cytoplasm of the cell.
Q5. What is the end product of glycolysis?
Ans: Pyruvate.
Q6. Where does Krebs’ cycle take place?
Ans: In the mitochondrial matrix.
Q7. What is the function of ETS?
Ans: It transfers electrons and helps in ATP production through oxidative phosphorylation.
Q8. What is fermentation?
Ans: It is anaerobic breakdown of glucose into ethanol or lactic acid with low energy yield.
Q9. What is aerobic respiration?
Ans: It is respiration in presence of oxygen with complete oxidation of glucose.
Q10. What is anaerobic respiration?
Ans: It is respiration without oxygen with incomplete oxidation of glucose.
Q11. What is RQ?
Ans: Respiratory Quotient is the ratio of CO₂ evolved to O₂ consumed.
Q12. What is the RQ value for fats?
Ans: About 0.7.
Q13. What is oxidative phosphorylation?
Ans: Formation of ATP using energy released in electron transport chain.
Q14. Why is respiration called amphibolic?
Ans: Because it involves both breakdown and synthesis processes.
Q15. What is the significance of step-wise energy release?
Ans: It ensures efficient energy conservation as ATP and prevents energy loss as heat.
II. Multiple Choice Questions (MCQs)
Q1. Respiration occurs in
(a) Dead cells
(b) Living cells
(c) Soil
(d) Air
Ans: (b)
Q2. Most common respiratory substrate is
(a) Protein
(b) Fat
(c) Glucose
(d) Vitamin
Ans: (c)
Q3. Glycolysis occurs in
(a) Nucleus
(b) Cytoplasm
(c) Mitochondria
(d) Ribosome
Ans: (b)
Q4. End product of glycolysis is
(a) Glucose
(b) Pyruvate
(c) ATP
(d) NADH
Ans: (b)
Q5. Krebs’ cycle occurs in
(a) Cytoplasm
(b) Mitochondrial matrix
(c) Ribosome
(d) Nucleus
Ans: (b)
Q6. ETS is located in
(a) Outer membrane
(b) Inner mitochondrial membrane
(c) Cytoplasm
(d) Nucleus
Ans: (b)
Q7. Final electron acceptor in respiration is
(a) CO₂
(b) Oxygen
(c) Hydrogen
(d) ATP
Ans: (b)
Q8. Fermentation occurs in
(a) Presence of oxygen
(b) Absence of oxygen
(c) High temperature
(d) Sunlight
Ans: (b)
Q9. Aerobic respiration produces
(a) Ethanol
(b) Lactic acid
(c) CO₂ and H₂O
(d) None
Ans: (c)
Q10. Anaerobic respiration produces
(a) Only CO₂
(b) Only water
(c) Ethanol or lactic acid
(d) Oxygen
Ans: (c)
Q11. ATP is produced mainly in
(a) Glycolysis
(b) Krebs’ cycle
(c) ETS
(d) Fermentation
Ans: (c)
Q12. RQ for carbohydrates is
(a) 0.7
(b) 1
(c) 1.5
(d) 2
Ans: (b)
Q13. RQ for fats is
(a) 1
(b) 0.7
(c) 2
(d) 1.5
Ans: (b)
Q14. Amphibolic pathway means
(a) Only breakdown
(b) Only synthesis
(c) Both breakdown and synthesis
(d) None
Ans: (c)
Q15. Oxidative phosphorylation occurs in
(a) Cytoplasm
(b) Nucleus
(c) Inner mitochondrial membrane
(d) Ribosome
Ans: (c)
Q16. NADH is produced in
(a) Glycolysis
(b) Krebs’ cycle
(c) Both
(d) None
Ans: (c)
Q17. FADH₂ is produced in
(a) Glycolysis
(b) Krebs’ cycle
(c) ETS
(d) Fermentation
Ans: (b)
Q18. Energy currency of cell is
(a) DNA
(b) ATP
(c) RNA
(d) Protein
Ans: (b)
Q19. Step-wise energy release helps in
(a) Heat loss
(b) Efficient ATP formation
(c) Cell death
(d) Water loss
Ans: (b)
Q20. Pyruvate is converted to acetyl-CoA in
(a) Cytoplasm
(b) Mitochondria
(c) Nucleus
(d) Ribosome
Ans: (b)
Q21. Number of ATP in glycolysis is
(a) 2
(b) 4
(c) 6
(d) 8
Ans: (a)
Q22. Fermentation regenerates
(a) ATP
(b) NAD⁺
(c) Oxygen
(d) CO₂
Ans: (b)
Q23. Complete oxidation of glucose yields
(a) Low ATP
(b) High ATP
(c) No ATP
(d) Variable
Ans: (b)
Q24. Oxygen is required in
(a) Glycolysis
(b) Krebs’ cycle
(c) ETS
(d) All
Ans: (c)
Q25. Citric acid cycle is also called
(a) Glycolysis
(b) Krebs’ cycle
(c) Calvin cycle
(d) Urea cycle
Ans: (b)
Q26. Substrate-level phosphorylation occurs in
(a) ETS
(b) Glycolysis
(c) Both glycolysis and Krebs’ cycle
(d) None
Ans: (c)
Q27. Water is formed in
(a) Glycolysis
(b) Krebs’ cycle
(c) ETS
(d) Fermentation
Ans: (c)
Q28. Maximum ATP is formed in
(a) Glycolysis
(b) Krebs’ cycle
(c) ETS
(d) Fermentation
Ans: (c)
Q29. Respiration is a
(a) Physical process
(b) Chemical process
(c) Biochemical process
(d) Mechanical process
Ans: (c)
Q30. Enzymes in respiration act
(a) Randomly
(b) Sequentially
(c) Independently
(d) Irregularly
Ans: (b)
