Class 11 Biology Chapter 15: Plant Growth and Development – 100 MCQs with Answers
1. The hormone promoting cell enlargement is:
Answer: B) Gibberellin
2. The site of perception of photoperiod is:
Answer: B) Leaf
3. Vernalisation induces:
Answer: B) Flowering
4. The most abundant plant hormone is:
Answer: A) Auxin
5. The process of losing ability to divide is called:
Answer: C) Differentiation
6. The hormone responsible for apical dominance:
Answer: B) Auxin
7. Bolting in plants is induced by:
Answer: D) Gibberellin
8. Short day plants require:
Answer: B) Short photoperiod
9. Which plant part is the main site for ABA synthesis?
Answer: B) Leaf
10. The natural gaseous plant hormone is:
Answer: A) Ethylene
11. The hormone responsible for fruit ripening is:
Answer: B) Ethylene
12. The phase where no visible growth takes place:
Answer: A) Lag phase
13. Pruning promotes branching due to:
Answer: A) Removal of auxin
14. Which event marks the onset of seed dormancy in plants?
Answer: C) Increased ABA
15. ‘Grand period of growth’ refers to:
Answer: B) Log phase
16. The process of re-gaining the capability of cell division is:
Answer: B) Dedifferentiation
17. Which hormone breaks seed dormancy?
Answer: C) Gibberellin
18. Parthenocarpy can be induced by:
Answer: A) IAA
19. Growth in plants is:
Answer: A) Open
20. Auxins are produced in:
Answer: A) Shoot tips
21. Growth rate is highest during:
Answer: B) Log phase
22. Which hormone inhibits growth:
Answer: C) ABA
23. Apical dominance can be overcome by:
Answer: A) Removing shoot apex
24. The hormone discovered from fungus is:
Answer: B) GA (Gibberellin)
25. Which phase comes after elongation?
Answer: B) Maturation
26. Ethylene is synthesized from:
Answer: A) Methionine
27. Which hormone is used to ripen mangoes commercially?
Answer: C) Ethylene
28. Which process is promoted by light in plants?
Answer: B) Photomorphogenesis
29. Which is called ‘stress hormone’ in plants?
Answer: B) ABA
30. Gibberellins were discovered in:
Answer: A) Fungi
31. In which organ is photoperiod measured first?
Answer: B) Leaf
32. Cell enlargement is largely attributed to:
Answer: B) Water uptake
33. Which is a natural auxin?
Answer: C) IAA
34. Vernalization effect is seen in:
Answer: A) Wheat
35. Which hormone promotes stomatal closure under stress?
Answer: A) ABA
36. Somatic embryogenesis is induced by:
Answer: C) 2,4-D
37. Growth curve of plants is:
Answer: A) Sigmoid
38. The hormone that stimulates root formation in cuttings:
Answer: B) Auxin
39. Dormancy of seeds is due to:
Answer: B) ABA
40. Which is responsible for geotropism in roots?
Answer: C) Auxin
41. Cytokinins were first isolated from:
Answer: B) Coconut milk
42. Which hormone delays leaf senescence?
Answer: A) Cytokinin
43. Which induces parthenocarpy?
Answer: A) IAA
44. A cell that loses its ability to divide and matures is:
Answer: B) Redifferentiated
45. Stomata open due to:
Answer: B) Turgor pressure increase in guard cells
46. Apical meristem produces:
Answer: D) All above
47. Which is not a plant growth hormone?
Answer: D) Amylase
48. Climacteric rise of respiration is found in:
Answer: A) Ripening fruit
49. Annual ring in wood shows:
Answer: B) Secondary growth
50. The plant response to light duration is called:
Answer: A) Photoperiodism
51. Growth in length occurs by:
Answer: A) Apical meristem
52. Which is an inhibitor of seed germination?
Answer: C) ABA
53. Abscission of leaves is promoted by:
Answer: D) Ethylene
54. Which phase follows steepest slope in a growth curve?
Answer: C) Stationary
55. Hormone involved in dormancy:
Answer: C) ABA
56. 2,4-D is used as:
Answer: A) Herbicide
57. Red light promotes:
Answer: A) Germination
58. Maximum growth is observed in:
Answer: A) Seedling
59. Cytokinins are synthesized in:
Answer: A) Root tip
60. Which is not a role of auxin?
Answer: C) Flower induction
61. ABA was first isolated from:
Answer: C) Maize
62. Photoperiodic stimulus is perceived by:
Answer: C) Leaf
63. Which plant hormone induces fruit ripening:
Answer: A) Ethylene
64. Which is not a function of cytokinins?
Answer: D) Promote apical dominance
65. Hormone used as weed killer:
Answer: B) 2,4-D
66. The type of growth shown by root tip:
Answer: A) Open
67. Who discovered gibberellins?
Answer: B) Kurosawa
68. Which hormone regulates photoperiodism?
Answer: B) Phytochrome
69. Which hormone prevents leaf abscission:
Answer: C) Auxin
70. Which is responsible for senescence?
Answer: C) ABA
71. Which is the site for secondary growth in plants?
Answer: B) Lateral meristem
72. Growth in diameter of stem occurs due to:
Answer: A) Cambium
73. Which hormone is related to photoperiodism?
Answer: B) Phytochrome
74. Etiolation refers to:
Answer: A) Rapid stem elongation
75. Flowering in some plants needs exposure to:
Answer: B) Low temp
76. Vernalization is required by:
Answer: B) Biennials
77. Which is not a plant growth regulator?
Answer: C) ATP
78. An example of long day plant:
Answer: A) Wheat
79. In fruit ripening, which hormone increases respiration:
Answer: D) Ethylene
80. Apical dominance results in:
Answer: B) Vertical growth
81. Growth curve is:
Answer: B) S-shaped
82. Cytokinins promote:
Answer: B) Cell division
83. Phytochrome exists in:
Answer: A) Two forms
84. The carbohydrate storing region in embryo:
Answer: D) Endosperm
85. Which promotes the movement of nutrients from old to young leaves:
Answer: A) Cytokinins
86. Which hormone increases during stress?
Answer: A) ABA
87. Which light inhibits hypocotyl elongation?
Answer: A) Red
88. Phytochrome is present in:
Answer: A) All plant cells
89. Endogenous dormancy refers to:
Answer: A) Imposed by embryo
90. ABA acts as:
Answer: A) Inhibitor
91. ABA was formerly called:
Answer: A) Dormin
92. Growth whose rate is proportional to size:
Answer: B) Geometric
93. Callus formation in tissue culture needs:
Answer: D) Both auxin & cytokinin
94. Endogenous hormones are:
Answer: A) Made inside
95. Seed dormancy is broken naturally by:
Answer: A) Passage of time
96. Who demonstrated root formation with auxin?
Answer: A) Skoog & Miller
97. Plant growth is:
Answer: A) Irreversible
98. Dormancy in potato tuber is broken by:
Answer: B) GA
99. Etiolation is a result of:
Answer: A) Dark
100. Which phase of growth is absent in determinate organs?
Answer: C) Stationary
End of MCQ List.
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