Class 11 Biology Chapter 11: Transport in Plants – 100 MCQs with Answers
1. The process by which water moves through a semipermeable membrane is called:
Answer: C) Osmosis
2. The movement of molecules from a region of higher concentration to a region of lower concentration is:
Answer: D) Simple diffusion
3. Water channel proteins in plant membranes are called:
Answer: C) Aquaporins
4. The pressure exerted by the protoplasts against the cell wall is:
Answer: A) Turgor pressure
5. Imbibition is maximum in:
Answer: D) Protein
6. The movement of minerals against the concentration gradient is:
Answer: B) Active transport
7. Water potential is highest in:
Answer: A) Pure water
8. The cell wall is:
Answer: C) Permeable
9. Which of the following will not show plasmolysis?
Answer: B) Xylem vessels
10. Transpiration is least in:
Answer: B) Humid climate
11. Water moves through root hairs by:
Answer: B) Osmosis
12. Pathway involving repeated crossing of plasma membrane is called:
Answer: A) Symplast
13. The cohesion-tension theory explains:
Answer: C) Ascent of sap
14. Root pressure is maximum at:
Answer: C) Early morning
15. Guttation takes place mainly through:
Answer: C) Hydathodes
16. Transpiration pull is a result of:
Answer: C) Loss of water from leaves
17. Which of the following does not require energy?
Answer: C) Diffusion
18. Oxygen is released during:
Answer: C) Photosynthesis
19. A plant cell placed in hypertonic solution becomes:
Answer: C) Plasmolysed
20. Diffusion of water vapour from intercellular spaces through stomata is:
Answer: C) Transpiration
21. The direction of movement in phloem is:
Answer: C) Both
22. Translocation of photosynthates takes place through:
Answer: B) Phloem
23. The term ‘girdling experiment’ is related to:
Answer: C) Translocation of food
24. Which element is required in the least quantity by plants?
Answer: A) Molybdenum
25. The main driving force for water movement up the xylem is:
Answer: C) Transpiration pull
26. Mass flow hypothesis explains:
Answer: C) Transport in phloem
27. Most water absorbed by roots is taken up by:
Answer: D) Root hairs
28. The process opposite to imbibition is:
Answer: C) Desorption
29. The term ‘symplast’ was given by:
Answer: A) Strasburger
30. Root hair absorbs water by:
Answer: A) Osmosis
31. Facilitated diffusion requires:
Answer: B) Carrier proteins
32. Which of the following is NOT a micronutrient?
Answer: C) Sulphur
33. Wilting occurs due to:
Answer: A) Water loss
34. The Casparian strip occurs in:
Answer: B) Endodermis
35. The main form in which food moves in phloem is:
Answer: A) Sucrose
36. When cells are placed in hypotonic solution, they become:
Answer: A) Turgid
37. Which is not part of apoplast pathway?
Answer: C) Cytoplasm
38. The main force for upward movement of water in tall trees is:
Answer: C) Transpiration pull
39. Cohesion and adhesion of water molecules help in:
Answer: C) Ascent of sap
40. During wilting, the value of water potential:
Answer: C) Decreases
41. Root pressure is absent in:
Answer: B) Gymnosperms
42. Ascent of sap occurs due to:
Answer: D) All above
43. The first external symptom of wilting is:
Answer: B) Drooping of leaf
44. Opening and closing of stomata is due to:
Answer: B) Turgor changes in guard cells
45. Guttation occurs in:
Answer: B) Leaves
46. Transpiration helps in:
Answer: D) All above
47. The unit of water potential is:
Answer: D) All above
48. Water potential of pure water at atmospheric pressure and room temperature:
Answer: A) Zero
49. Water moves from:
Answer: A) High ψ to low ψ
50. Pressure flow hypothesis explains:
Answer: B) Food movement
51. In translocation, sink is generally:
Answer: C) Root, fruit, flower
52. Source to sink movement occurs in:
Answer: B) Phloem
53. Guttation is best observed in:
Answer: B) Night with high humidity
54. Transpiration occurs fastest in:
Answer: A) Low humidity
55. Plasmolysis does not occur in:
Answer: B) Dead cells
56. Stomata open due to:
Answer: B) Gain in turgor by guard cells
57. The closing of stomata is induced by:
Answer: A) Abscisic acid
58. The translocation of food is mainly:
Answer: A) Active
59. Root pressure is due to:
Answer: D) Active absorption
60. Water is mainly lost from:
Answer: C) Leaves
61. The loss of water in liquid form from leaf margin is called:
Answer: B) Guttation
62. Lowest water potential exists in:
Answer: C) Leaves
63. Absorption of minerals by roots is mostly:
Answer: A) Active
64. Major pathway for movement of water in roots is:
Answer: A) Apoplast
65. Guard cells differ from epidermal cells in having:
Answer: A) Chloroplasts
66. Symplastic movement occurs through:
Answer: A) Plasmodesmata
67. Water potential is measured with:
Answer: C) Psychrometer
68. Opening of stomata is facilitated by:
Answer: A) K⁺ influx
69. Main water loss from mesophyll occurs by:
Answer: A) Diffusion
70. In plants, rate of transpiration is measured by:
Answer: A) Potometer
71. Antitranspirant chemicals are used to:
Answer: B) Reduce transpiration
72. Sieve tube elements are living because of:
Answer: B) Presence of companion cell
73. Bulk flow refers to movement of:
Answer: C) Both
74. The term “Imbibant” refers to:
Answer: B) Substance that absorbs water
75. Plant cell in isotonic solution will be:
Answer: B) Flaccid
76. Water absorption through the root hair cell wall is:
Answer: B) Passive
77. Experimental proof of phloem transport was given by:
Answer: D) Ringing experiment
78. Main pathway of water across cortex is:
Answer: A) Apoplast
79. Plasmolysis is:
Answer: B) Loss of water
80. Water is lost from the plant by:
Answer: D) All above
81. The opening between guard cells is:
Answer: D) Stoma
82. Water-conducting tissue in higher plants is:
Answer: A) Xylem
83. The process of water loss as droplets:
Answer: B) Guttation
84. Plasmodesmata help in:
Answer: C) Symplastic movement
85. Plants use most of their water absorbed for:
Answer: D) Transpiration
86. In guard cells, opening of stomata is associated with:
Answer: B) Influx of K⁺
87. Which is NOT a function of transpiration?
Answer: D) Provides energy for growth
88. The movement of ions through phloem is called:
Answer: A) Translocation
89. Selective permeability is shown by:
Answer: B) Plasma membrane
90. Root pressure can be measured using a:
Answer: B) Manometer
91. Opening of stomata is promoted by:
Answer: A) Sunlight
92. The movement of water through the xylem is mainly:
Answer: B) Passive
93. The soil solution moves into the root by:
Answer: D) All above
94. Plant cell immersed in hypertonic solution becomes:
Answer: A) Plasmolysed
95. In which of the following, transpiration rate is the lowest?
Answer: B) Cactus
96. Phloem loading is:
Answer: B) Active
97. The water-conducting element in angiosperms is:
Answer: C) Vessel element
98. Lateral movement of water and mineral takes place through:
Answer: C) Ray parenchyma
99. Which is NOT essential for opening of stomata?
Answer: D) Dark
100. Water from soil reaches leaves through:
Answer: A) Xylem
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