Photosynthesis and Cellular Respiration Past Paper PDF

1. What is the main product of photosynthesis? a. Oxygen **b. Glucose** c. Carbon dioxide d. ATP 2. **In which part of the chloroplast does the light-dependent reaction occur?** a. Stroma **b. Thylakoid membrane** c. Mitochondria d. Cytoplasm 3. **What molecule is broken down durin...

1. What is the main product of photosynthesis? a. Oxygen **b. Glucose** c. Carbon dioxide d. ATP 2. **In which part of the chloroplast does the light-dependent reaction occur?** a. Stroma **b. Thylakoid membrane** c. Mitochondria d. Cytoplasm 3. **What molecule is broken down during glycolysis?** a. Carbon dioxide **b. Glucose** c. Oxygen d. Pyruvate 4. **What is the main purpose of the Calvin cycle?** a. To produce oxygen **b. To make glucose** c. To release ATP d. To absorb sunlight 5. **Which stage of cellular respiration produces the most ATP?** a. Glycolysis b. Krebs cycle **c. Electron transport chain** d. Fermentation 6. **What is the source of energy for photosynthesis?** a. Heat **b. Sunlight** c. ATP d. Glucose 7. **Where does the Krebs cycle occur?** a. Cytoplasm **b. Mitochondrial matrix** c. Thylakoid d. Stroma 8. **What gas is taken in by plants during photosynthesis?**  a. Oxygen b. Nitrogen **c. Carbon dioxide** d. Hydrogen 9. **What is the name of the enzyme that helps produce ATP during the electron transport chain?** a. RuBisCO **b. ATP synthase** c. NADPH d. Pyruvate kinase 10. **What is the main energy carrier in cells?** a. Glucose **b. ATP** c. Oxygen d. NADPH 11. **Which pigment is primarily responsible for capturing light in photosynthesis?** a. Carotenoid **b. Chlorophyll** c. Xanthophyll d. Anthocyanin 12. **Which organism performs photosynthesis?** **a. Plants** b. Animals c. Fungi d. Bacteria only 13. **What are the reactants in cellular respiration?** a. Glucose and oxygen **b. Oxygen and glucose** c. Carbon dioxide and water d. ATP and oxygen 14. **What gas is a byproduct of photosynthesis?** **a. Oxygen** b. Carbon dioxide c. Methane d. Hydrogen 15. **What is the name of the cycle that occurs during photosynthesis to produce sugar?** a. Krebs cycle  b. Electron transport chain **c. Calvin cycle** d. Glycolysis 16. **Which step occurs first in cellular respiration?** **a. Glycolysis** b. Krebs cycle c. Electron transport chain d. Fermentation 17. **What molecule acts as the final electron acceptor in cellular respiration?** a. Carbon dioxide b. Hydrogen c. NADH **d. Oxygen** 18. **What powers the light-dependent reactions?** **a. Sunlight** b. Glucose c. ATP d. NADPH 19. **Which organelle is responsible for photosynthesis?** **a. Chloroplast** b. Mitochondria c. Ribosome d. Vacuole 20. **What happens to water molecules in the light-dependent reactions?** a. They are converted into glucose. **b. They are split into oxygen, protons, and electrons.** c. They are stored in the stroma. d. They remain unchanged. 21. **What is the role of NADPH in photosynthesis?** a. To absorb light **b. To carry high-energy electrons** c. To produce ATP d. To store oxygen 22. **Where does glycolysis take place?** **a. Cytoplasm** b. Mitochondria c. Chloroplast  d. Nucleus 23. **Which molecule is both a reactant in photosynthesis and a product of cellular respiration?** a. ATP **b. Carbon dioxide** c. Water d. Glucose 24. **What happens to glucose during cellular respiration?** **a. It is broken down to release energy.** b. It is stored as starch. c. It is converted into carbon dioxide. d. It is used to produce sunlight. 25. **What is the function of stomata in plants?** **a. Gas exchange** b. Absorption of water c. Storage of glucose d. Light absorption 26. **Which part of the cell is responsible for most ATP production?** a. Cytoplasm b. Chloroplast **c. Mitochondria** d. Ribosome 27. **What is the main energy source for cellular respiration?** **a. Glucose** b. ATP c. Sunlight d. Oxygen 28. **What is the role of RuBisCO in photosynthesis?** a. Produces ATP **b. Fixes carbon dioxide into organic molecules** c. Transports electrons d. Absorbs sunlight 29. **How many ATP molecules are produced during glycolysis?** a. 4 **b. 2** c. 8 d. 6 30. **What are the products of the Krebs cycle?** a. Glucose and oxygen **b. ATP, NADH, FADH₂, and carbon dioxide** c. Water and pyruvate d. Glucose and ATP 31. **What is the main output of the light-dependent reactions?** a. Glucose **b. ATP and NADPH** c. Water d. Oxygen 32. **Which process releases carbon dioxide?** a. Light-dependent reactions **b. Krebs cycle** c. Glycolysis d. Calvin cycle 33. **Where is chlorophyll found in the chloroplast?** a. Stroma **b. Thylakoid membrane** c. Outer membrane d. Inner membrane 34. **What is the total number of ATP molecules produced during cellular respiration?** a. 12 b. 24 c. 18 **d. 36-38** 35. **Which molecule is regenerated in the Calvin cycle?** a. Pyruvate b. NADPH **c. RuBP** d. FADH₂ 36. **What role does oxygen play in cellular respiration?** a. It breaks down glucose. b. It absorbs sunlight. c. It stores ATP. **d. It acts as the final electron acceptor.** 37. **What is a byproduct of the Krebs cycle?** a. Glucose b. NADPH **c. Carbon dioxide** d. Oxygen 38. **How do plants obtain carbon dioxide?** a. Through their roots b. From glucose **c. Through stomata** d. By splitting water 39. **Which stage of photosynthesis uses ATP and NADPH?** a. Light-dependent reactions **b. Calvin cycle** c. Electron transport chain d. Glycolysis 40. **What is the main purpose of cellular respiration?** a. To store energy in glucose b. To release oxygen c. To convert light energy into chemical energy **d. To produce ATP** 41. **Which type of organism performs both photosynthesis and cellular respiration?** a. Animals b. Fungi c. Bacteria only **d. Plants** 42. **What are the products of the light-dependent reactions of photosynthesis?** a. Oxygen and glucose **b. ATP, NADPH, and oxygen** c. Pyruvate and ATP d. Carbon dioxide and water 43. **What happens to pyruvate before entering the Krebs cycle?** **a. It is converted into acetyl-CoA.** b. It is broken down into glucose. c. It combines with oxygen. d. It is stored in the mitochondria. 44. **Which molecule carries high-energy electrons to the electron transport chain in cellular respiration?**  a. ATP b. Oxygen **c. NADH and FADH₂** d. Water 45. **What is the role of water in photosynthesis?** a. It stores energy. **b. It provides electrons and protons for the light-dependent reactions.** c. It absorbs sunlight. d. It captures carbon dioxide. 46. **What is the first stage of photosynthesis?** **a. Light-dependent reactions** b. Calvin cycle c. Glycolysis d. Krebs cycle 47. **What happens during chemiosmosis in the mitochondria?** a. Glucose is broken down. **b. ATP is produced by ATP synthase using a proton gradient.** c. Carbon dioxide is fixed. d. Oxygen is released. 48. **Which process in cellular respiration occurs in the cytoplasm?** **a. Glycolysis** b. Krebs cycle c. Electron transport chain d. Calvin cycle 49. **What happens to glucose during photosynthesis?** a. It is broken down. b. It is released as energy. **c. It is synthesized as a storage form of energy.** d. It is absorbed from the air. 50. **What is the net ATP gain from glycolysis?** a. 4 ATP **b. 2 ATP** c. 6 ATP d. 1 ATP 51. **What is produced in alcoholic fermentation?** **a. Ethanol, carbon dioxide, and ATP** b. Lactic acid and ATP  c. Oxygen and glucose d. Water and pyruvate 52. **Which gas is released as a waste product of cellular respiration?** a. Oxygen b. Nitrogen **c. Carbon dioxide** d. Methane 53. **What is the function of NADH in cellular respiration?** **a. To carry high-energy electrons to the electron transport chain** b. To store ATP c. To convert glucose into pyruvate d. To fix carbon dioxide 54. **Which process is anaerobic?** **a. Glycolysis** b. Krebs cycle c. Calvin cycle d. Electron transport chain 55. **What is the main product of fermentation in muscle cells?** a. Ethanol **b. Lactic acid** c. Glucose d. Carbon dioxide 56. **How is energy stored in ATP?** a. In the phosphate bonds **b. In the bond between the second and third phosphate groups** c. In the adenine group d. In the ribose sugar 57. **What drives the ATP synthase in the electron transport chain?** **a. Proton gradient across the membrane** b. Flow of electrons c. Carbon dioxide concentration d. Glucose breakdown 58. **What does the Calvin cycle produce?** a. ATP b. NADPH **c. Glucose** d. Oxygen 59. **Which step of cellular respiration is oxygen directly involved in?** a. Glycolysis b. Krebs cycle **c. Electron transport chain** d. Fermentation 60. **What happens to NADPH after the light-dependent reactions?** a. It is converted into water. **b. It is used in the Calvin cycle to make glucose.** c. It is released as a waste product. d. It is stored in the mitochondria. --- #### **Continuation (61–70)** 61. **How do cells use ATP?** **a. To power cellular work** b. To store energy permanently c. To absorb light energy d. To produce oxygen 62. **Which organisms use fermentation?** a. Only animals b. Only plants c. Only bacteria **d. Bacteria, plants, and animals** 63. **Which stage of photosynthesis occurs in the stroma?** a. Light-dependent reactions **b. Calvin cycle** c. Electron transport chain d. Glycolysis 64. **What happens during photolysis in photosynthesis?** **a. Water is split into oxygen, electrons, and protons.** b. Glucose is broken down into ATP. c. Oxygen is absorbed into the chloroplast. d. ATP is produced. 65. **What is the electron donor in photosynthesis?** a. Carbon dioxide b. ATP **c. Water**  d. Glucose 66. **How does ATP provide energy?** a. By storing oxygen **b. By releasing a phosphate group** c. By absorbing glucose d. By breaking down glucose 67. **What process provides energy for muscle activity when oxygen is scarce?** a. Alcoholic fermentation **b. Lactic acid fermentation** c. Light-dependent reactions d. Krebs cycle 68. **What is the waste product of light-dependent reactions?** **a. Oxygen** b. Glucose c. NADPH d. Water 69. **Which stage of cellular respiration produces water?** a. Glycolysis b. Krebs cycle **c. Electron transport chain** d. Fermentation 70. **What energy transformation occurs during cellular respiration?** a. Chemical to light energy b. Light to chemical energy **c. Chemical to usable energy (ATP)** d. Heat to kinetic energy 71. **What is the main purpose of aerobic respiration?** a. To release oxygen b. To store glucose c. To produce ATP efficiently **d. To convert glucose into usable energy (ATP)** 72. **What is required for aerobic respiration to occur?** a. Glucose and nitrogen b. Glucose and water c. Glucose and carbon dioxide **d. Glucose and oxygen** 73. **Which of the following is a characteristic of aerobic respiration?** a. Does not require oxygen **b. Produces more ATP than anaerobic respiration** c. Only occurs in plants d. Takes place in the cytoplasm only 74. **Where in the cell does aerobic respiration mainly take place?** a. Cytoplasm b. Chloroplast c. Ribosome **d. Mitochondria** 75. **Which stage of aerobic respiration occurs in the mitochondria?** a. Glycolysis only b. Krebs cycle only c. Electron transport chain only **d. Both Krebs cycle and electron transport chain** 76. **What happens to the oxygen used in aerobic respiration?** a. It combines with glucose to form ATP. b. It is converted into glucose. **c. It combines with electrons and hydrogen ions to form water.** d. It is stored in the cytoplasm. 77. **How many molecules of ATP are produced during aerobic respiration from one glucose molecule?** a. 2 b. 20 c. 28 **d. 36-38** 78. **What byproducts are produced during aerobic respiration?** a. Oxygen and glucose b. Lactic acid and water **c. Carbon dioxide and water** d. Nitrogen and oxygen 79. **What role does the electron transport chain play in aerobic respiration?** a. It breaks down glucose into pyruvate. b. It converts pyruvate into ATP directly. **c. It produces a proton gradient to generate ATP.** d. It splits oxygen into carbon dioxide. 80. **Which is true about aerobic respiration compared to anaerobic respiration?** a. Aerobic respiration occurs only in prokaryotes. b. Aerobic respiration is faster than anaerobic respiration. **c. Aerobic respiration produces more ATP than anaerobic respiration.** d. Aerobic respiration does not require glucose. Remove all the asterisks