Class 11 Biology Chapter 13: Photosynthesis in Higher Plants – 100 MCQs with Answers
1. Process of conversion of solar energy to chemical energy is called:
Answer: B) Photosynthesis
2. The site of light reaction is:
Answer: B) Thylakoid
3. Green pigment involved in photosynthesis is:
Answer: A) Chlorophyll
4. Photosynthesis equation was framed by:
Answer: D) Van Helmont
5. Oxygen is evolved from:
Answer: B) H2O
6. The first stable product of C3 cycle is:
Answer: A) PGA
7. The main photosynthetic pigment is:
Answer: A) Chlorophyll-a
8. The plants which fix CO2 at night are:
Answer: C) CAM
9. The Hill reaction involves:
Answer: A) Oxygen evolution
10. Site of dark reaction is:
Answer: C) Stroma
11. The source of oxygen released in photosynthesis:
Answer: B) Water
12. Photosystem II is involved in:
Answer: A) Water splitting
13. Chemiosmotic hypothesis was proposed by:
Answer: C) Peter Mitchell
14. Carboxylation in C3 plants is by:
Answer: B) RuBisCO
15. C4 plants show special cells called:
Answer: B) Bundle sheath
16. Kranz anatomy is seen in:
Answer: C) C4 plants
17. Which pigment absorbs red and blue light maximally?
Answer: A) Chlorophyll-a
18. Photosynthetic phosphorylation is formation of:
Answer: A) ATP
19. Number of Calvin cycle turns to form 1 glucose:
Answer: D) 6
20. Primary acceptor of CO2 in C4 plants:
Answer: C) PEP
21. Photolysis of water in chloroplast requires:
Answer: B) Mn
22. Product of photorespiration is:
Answer: D) Both B and C
23. Z-scheme of electron transport involves:
Answer: C) Both ATP and NADPH
24. Hill’s reaction provides evidence for:
Answer: B) Photolysis of water
25. CO2 compensation point is lowest in:
Answer: B) C4
26. Quantum yield is maximum in which light?
Answer: C) Red
27. Chlorophyll-a has how many pyrrole rings?
Answer: C) 4
28. Emerson effect shows:
Answer: B) Enhancement when red and far-red are given
29. In which plants does photorespiration not occur?
Answer: D) Both B and C
30. The most effective wavelength for photosynthesis:
Answer: D) Red
31. The first step of Calvin cycle is:
Answer: B) Carboxylation
32. PEP is found in which pathway?
Answer: B) C4
33. During cyclic photophosphorylation:
Answer: A) Only ATP is formed
34. Absorption peak of chlorophyll-b is in:
Answer: A) Blue
35. The process that fixes atmospheric CO2:
Answer: A) Calvin cycle
36. Light independent reactions occur in:
Answer: A) Stroma
37. The role of ATP and NADPH in Calvin cycle is:
Answer: B) Reduction
38. Carboxylation enzyme in C4 plants in mesophyll is:
Answer: B) PEP carboxylase
39. PS I is also called:
Answer: A) P700
40. Split water molecule releases:
Answer: D) All of these
41. The number of RuBP regenerations per glucose molecule:
Answer: C) 6
42. Function of accessory pigments:
Answer: A) Light harvesting
43. Which enzyme is found only in C4 plants?
Answer: C) PEPCase
44. Stomatal opening is regulated by:
Answer: C) Turgor pressure
45. Which is true for cyclic photophosphorylation?
Answer: A) Only PS I
46. Maximum photosynthetic rate occurs at:
Answer: B) Red light
47. Dark reaction does not require:
Answer: C) Light
48. Subunit of RuBisCO is coded from:
Answer: C) Both
49. In C4 plants, CO2 is first incorporated into:
Answer: B) 4-carbon compound
50. The acceptor molecule for CO2 in Calvin cycle:
Answer: C) RuBP
51. Limiting factor concept was proposed by:
Answer: A) Blackman
52. Evolution of O2 occurs at which complex?
Answer: B) PS II
53. End product of light reaction:
Answer: C) ATP and NADPH
54. In photorespiration, which organelle is NOT involved?
Answer: D) Golgi body
55. First stable product of Calvin cycle:
Answer: B) PGA
56. Which pigment is not found in green plants?
Answer: C) Phycobilin
57. Source of electrons for photosynthesis:
Answer: B) H2O
58. Enzyme carboxylase-oxygenase is:
Answer: A) RuBisCO
59. In C3 pathway, how many ATP required for 1 glucose?
Answer: B) 18
60. Function of NADPH:
Answer: C) Reducing agent in Calvin cycle
61. Which structure is common for PS I and PS II?
Answer: D) Chlorophyll-a
62. ATP synthetase is present in:
Answer: B) Grana thylakoid
63. Photorespiration is favored by:
Answer: D) All above
64. Which compound donates electron to P680+?
Answer: A) H2O
65. Which is not a step of dark reaction?
Answer: B) Photooxidation
66. Red drop effect was discovered by:
Answer: A) Emerson
67. Which is not a product of light reaction?
Answer: D) Glucose
68. Oxygen inhibition of photosynthesis is least in:
Answer: B) C4
69. Which absorbs maximum light for photosynthesis?
Answer: C) Red
70. Photosynthetic unit is called:
Answer: C) Quantasome
71. Functional role of grana is:
Answer: B) Light reaction
72. The enzyme for first carboxylation in CAM plants:
Answer: B) PEP carboxylase
73. During photorespiration, CO2 is released in:
Answer: C) Mitochondria
74. O2 not evolved during photosynthesis in:
Answer: A) Bacteria
75. Maximum O2 evolution is with which color:
Answer: B) Red
76. Carotenoids are accessory pigments because:
Answer: A) Transfer light energy
77. Which is not part of Calvin cycle?
Answer: D) Photolysis
78. Which is a 5-carbon compound?
Answer: A) RuBP
79. Final product of photosynthesis:
Answer: B) Glucose
80. Source of electrons in PS I:
Answer: B) Plastocyanin
81. Number of CO2 required for 1 glucose in Calvin cycle:
Answer: C) 6
82. Complete oxidation of 1 mole glucose yields how much ATP in plant cell?
Answer: C) 38
83. RuBisCO enzyme combines with:
Answer: C) Both
84. During photosynthesis, protons accumulate in:
Answer: B) Thylakoid lumen
85. The energy currency of cells:
Answer: C) ATP
86. DCMU inhibits:
Answer: A) Electron flow PS II
87. Calvin cycle also called:
Answer: A) C3 cycle
88. The stroma contains:
Answer: A) Enzymes of Calvin cycle
89. Measuring O2 evolution is a method for:
Answer: B) Photosynthesis
90. The “Dark Reaction” is called so because:
Answer: B) Not directly dependent on light
91. “Photophosphorylation” means formation of:
Answer: B) ATP using light
92. Blackman’s law of limiting factors states at a time only:
Answer: B) Only one limits
93. O2 evolution related to which pigment?
Answer: C) Chlorophyll-a
94. CAM plants photosynthesize efficiently in:
Answer: A) Hot, dry climates
95. Which is the limiting factor for photosynthesis in field conditions?
Answer: A) CO2
96. Hatch and Slack pathway is another name for:
Answer: A) C4 cycle
97. C4 pathway minimizes:
Answer: A) Photorespiration
98. The number of CO2 molecules fixed in one Calvin cycle turn:
Answer: A) 1
99. Reduction of CO2 in Calvin cycle occurs by:
Answer: A) ATP and NADPH
100. Thylakoid is the site for:
Answer: A) Light reaction