1. Which of the following is the primary site for respiration in plants?
    • A. Chloroplast
    • B. Mitochondria
    • C. Ribosome
    • D. Endoplasmic reticulum
      Answer: B. Mitochondria
  2. What is the main purpose of respiration in plants?
    • A. Storage of energy
    • B. Release of energy
    • C. Absorption of nutrients
    • D. Synthesis of proteins
      Answer: B. Release of energy
  3. Which process in plant respiration produces ATP?
    • A. Glycolysis
    • B. Calvin Cycle
    • C. Transcription
    • D. Photosynthesis
      Answer: A. Glycolysis
  4. In aerobic respiration, the final electron acceptor is:
    • A. Oxygen
    • B. Carbon dioxide
    • C. NADH
    • D. ATP
      Answer: A. Oxygen
  5. What is the end product of glycolysis?
    • A. Glucose
    • B. Pyruvate
    • C. Lactate
    • D. Ethanol
      Answer: B. Pyruvate
  6. Where does glycolysis occur in the cell?
    • A. Mitochondria
    • B. Cytoplasm
    • C. Chloroplast
    • D. Nucleus
      Answer: B. Cytoplasm
  7. The process of anaerobic respiration in plants leads to the production of:
    • A. Lactic acid
    • B. Ethanol and carbon dioxide
    • C. Oxygen and water
    • D. Acetyl CoA
      Answer: B. Ethanol and carbon dioxide
  8. Which of the following is NOT a stage of aerobic respiration?
    • A. Glycolysis
    • B. Krebs Cycle
    • C. Calvin Cycle
    • D. Electron Transport Chain
      Answer: C. Calvin Cycle
  9. In the Krebs cycle, acetyl-CoA combines with which molecule?
    • A. Pyruvate
    • B. Oxaloacetate
    • C. Glucose
    • D. Citrate
      Answer: B. Oxaloacetate
  10. Which of the following is a product of the electron transport chain?
    • A. Glucose
    • B. ATP and water
    • C. Pyruvate
    • D. Carbon dioxide
      Answer: B. ATP and water
  11. Respiratory quotient (RQ) is the ratio of:
    • A. Oxygen consumed to carbon dioxide produced
    • B. Carbon dioxide produced to oxygen consumed
    • C. Water produced to glucose consumed
    • D. ATP produced to glucose consumed
      Answer: B. Carbon dioxide produced to oxygen consumed
  12. Which respiratory pathway operates in the absence of oxygen?
    • A. Aerobic respiration
    • B. Anaerobic respiration
    • C. Krebs cycle
    • D. Electron transport chain
      Answer: B. Anaerobic respiration
  13. Fermentation in plant cells primarily produces:
    • A. Lactic acid
    • B. Ethanol
    • C. Urea
    • D. Glucose
      Answer: B. Ethanol
  14. The enzyme responsible for splitting glucose during glycolysis is:
    • A. Hexokinase
    • B. Phosphofructokinase
    • C. Pyruvate kinase
    • D. Amylase
      Answer: A. Hexokinase
  15. What is the ATP yield from one molecule of glucose in aerobic respiration?
    • A. 2 ATP
    • B. 4 ATP
    • C. 32-38 ATP
    • D. 50 ATP
      Answer: C. 32-38 ATP
  16. What is the key molecule entering the mitochondria after glycolysis?
    • A. Glucose
    • B. Pyruvate
    • C. Acetyl-CoA
    • D. Citrate
      Answer: B. Pyruvate
  17. Which coenzyme is reduced in the Krebs cycle?
    • A. NAD+
    • B. ATP
    • C. FADH2
    • D. ADP
      Answer: A. NAD+
  18. The terminal step in the electron transport chain involves the formation of:
    • A. ATP
    • B. Oxygen
    • C. Water
    • D. NADH
      Answer: C. Water
  19. Which pathway is common to both aerobic and anaerobic respiration?
    • A. Electron transport chain
    • B. Krebs cycle
    • C. Glycolysis
    • D. Photosynthesis
      Answer: C. Glycolysis
  20. What happens to excess glucose in plants during respiration?
    • A. Stored as glycogen
    • B. Stored as starch
    • C. Converted into ATP
    • D. Released as CO2
      Answer: B. Stored as starch
  21. Which is a waste product of aerobic respiration?
    • A. Water
    • B. Glucose
    • C. Ethanol
    • D. Lactate
      Answer: A. Water
  22. The energy currency of the cell is:
    • A. DNA
    • B. ATP
    • C. RNA
    • D. NADH
      Answer: B. ATP
  23. Where does the Krebs cycle take place?
    • A. Cytoplasm
    • B. Mitochondrial matrix
    • C. Chloroplast
    • D. Nucleus
      Answer: B. Mitochondrial matrix
  24. Which gas is essential for aerobic respiration?
    • A. Oxygen
    • B. Carbon dioxide
    • C. Nitrogen
    • D. Hydrogen
      Answer: A. Oxygen
  25. How many molecules of ATP are produced from one molecule of NADH in the electron transport chain?
    • A. 1
    • B. 2
    • C. 3
    • D. 4
      Answer: C. 3
  26. The main substrate used in plant respiration is:
    • A. Protein
    • B. Lipid
    • C. Carbohydrate
    • D. Nucleic acid
      Answer: C. Carbohydrate
  27. In anaerobic conditions, the pyruvate is converted into:
    • A. Lactic acid
    • B. Glucose
    • C. Ethanol
    • D. Water
      Answer: C. Ethanol
  28. Which of the following processes generates the most ATP?
    • A. Glycolysis
    • B. Krebs cycle
    • C. Electron transport chain
    • D. Fermentation
      Answer: C. Electron transport chain
  29. In plant respiration, CO2 is released during:
    • A. Glycolysis
    • B. Krebs cycle
    • C. Calvin cycle
    • D. Photosynthesis
      Answer: B. Krebs cycle
  30. Respiration rate in plants is highest during:
    • A. Daytime
    • B. Nighttime
    • C. Both equally
    • D. None of the above
      Answer: B. Nighttime

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