Take 5 chapter-wise practice tests plus 1 full module test on Transport in Plants for NEET with +4/-1 scoring, answer review, and concise explanations.
Attempt 5 focused practice tests and 1 mixed module test for Transport in Plants with 25 NEET-style MCQs in each practice set.
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1. Net movement of molecules from higher to lower concentration is:
Explanation: Diffusion proceeds down the concentration gradient without energy input.
2. Movement of water through a selectively permeable membrane is:
Explanation: Osmosis is specifically the movement of water across a semipermeable membrane.
3. Passive transport occurs:
Explanation: Passive movement is spontaneous and does not use direct metabolic energy.
4. Active transport requires:
Explanation: Active transport moves solutes against their gradient with energy support.
5. A cell placed in a hypertonic solution will:
Explanation: Water moves out of the cell into the more concentrated external medium.
6. A plant cell becomes turgid in a:
Explanation: Water enters the cell and increases turgor in a hypotonic medium.
7. Water moves from:
Explanation: This is the basic rule of water movement in plant systems.
8. Water potential of pure water is:
Explanation: Pure water at standard conditions has water potential equal to zero.
9. Adding solute to pure water makes its water potential:
Explanation: Solutes reduce the free energy of water and make water potential lower.
10. Pressure exerted by cell contents on the wall is:
Explanation: Turgor pressure helps maintain firmness in herbaceous tissues.
11. Movement through cell walls and intercellular spaces is:
Explanation: The apoplast is the non-living continuum outside plasma membranes.
12. Movement from cell to cell through plasmodesmata is:
Explanation: The symplast is the living continuum of connected cytoplasm.
13. Casparian strips are present in the:
Explanation: Casparian strips occur in endodermal cells and block the apoplastic route.
14. Facilitated diffusion differs from active transport because it:
Explanation: Facilitated diffusion still uses proteins, but movement is down the gradient.
15. Plasmolysis is best described as:
Explanation: Water loss causes the protoplast to pull away from the cell wall.
16. Diffusion rate is faster when:
Explanation: Higher temperature increases molecular motion and speeds diffusion.
17. Which pair is correctly matched?
Explanation: Plasmolysis is caused by water leaving a cell in a hypertonic medium.
18. Carrier proteins are especially important for:
Explanation: Carriers help move specific solutes across cell membranes.
19. A fully turgid cell in equilibrium with pure water has total water potential:
Explanation: At full turgor, pressure potential balances the negative solute potential.
20. The best summary of short-distance transport is:
Explanation: This combines diffusion, osmosis, water potential, and pathway logic.
21. Most water enters the plant through:
Explanation: Root hairs provide a large absorptive surface area.
22. Root hairs absorb water mainly because their cell sap has:
Explanation: Water moves osmotically from soil into root hair cells.
23. Apoplastic flow is blocked at the endodermis by:
Explanation: These force water to enter the symplast before the stele.
24. Root pressure is generated mainly by:
Explanation: Ion accumulation lowers water potential and draws water into xylem.
25. Root pressure is more noticeable when:
Explanation: Root pressure is clearer at night or early morning under well-watered conditions.
26. Liquid water loss through leaf margins is:
Explanation: Guttation is loss of liquid water droplets, not vapor.
27. Guttation occurs through:
Explanation: Hydathodes are specialized structures near leaf tips or margins.
28. Oozing of sap from cut plant parts is called:
Explanation: Positive root pressure can force sap out of an injured stem.
29. Water and minerals move upward mainly through:
Explanation: Xylem is the main long-distance water-conducting tissue.
30. The accepted explanation for ascent of sap is:
Explanation: The main upward force comes from transpiration-generated tension.
31. Cohesion means attraction between:
Explanation: Hydrogen bonding causes cohesion among water molecules.
32. Adhesion refers to attraction between:
Explanation: Adhesion helps keep the water column attached to xylem surfaces.
33. Continuity of the water column in xylem is maintained mainly by:
Explanation: Cohesion keeps water molecules linked in a continuous column.
34. Capillarity alone cannot explain water rise in tall trees because:
Explanation: Capillary rise is insufficient for the heights reached in tall trees.
35. Water enters the xylem from cortex due to:
Explanation: Ion accumulation in xylem helps create this inward gradient.
36. Mycorrhiza improves plant uptake especially of:
Explanation: Fungal hyphae increase absorption area and aid nutrient uptake.
37. Which statement is correct?
Explanation: Tall trees depend mainly on transpiration pull, not root pressure.
38. Water flow from soil to root to xylem is best seen as:
Explanation: Water moves continuously from higher to lower water potential.
39. The innermost layer of root cortex is:
Explanation: The endodermis forms the selective barrier around the stele.
40. The best summary of water uptake and ascent is:
Explanation: This integrates absorption, xylem movement, and leaf-driven pull.
41. The upward movement of water through xylem is called:
Explanation: Ascent of sap refers to long-distance xylem transport.
42. Root pressure is usually positive because xylem sap becomes:
Explanation: Active ion entry into xylem lowers its water potential.
43. Hydathodes are associated with:
Explanation: Hydathodes discharge liquid droplets when root pressure is sufficient.
44. A plant may still wilt in moist soil if:
Explanation: Excessive atmospheric demand can outpace root water uptake.
45. Which pair is correctly matched?
Explanation: Cohesion links water molecules, while adhesion is water-wall attraction.
46. The chief conducting element for water in angiosperms is:
Explanation: Vessels are efficient water-conducting elements in angiosperm xylem.
47. Tracheids also conduct water in:
Explanation: Tracheids are another xylem conducting element, especially important in gymnosperms.
48. Which is most directly responsible for pulling water upward in the xylem?
Explanation: Leaf evaporation creates tension that pulls the xylem column upward.
49. Loss of liquid water from a cut stem is more closely related to:
Explanation: Positive root pressure can force sap out of cut stems.
50. The strongest summary of xylem transport is:
Explanation: This captures the cohesion-tension explanation clearly.
51. Loss of water vapor from aerial parts is:
Explanation: Transpiration is mainly vapor loss from leaves.
52. Most transpiration occurs through:
Explanation: Stomatal transpiration contributes the major share in most plants.
53. Opening and closing of stomata are controlled by:
Explanation: Guard cell turgidity determines the stomatal aperture.
54. Guard cells open stomata when they:
Explanation: Increased turgor bends guard cells outward and opens the pore.
55. Light usually increases transpiration because it:
Explanation: Guard cells often open in light, allowing more vapor loss.
56. High atmospheric humidity usually:
Explanation: High humidity lowers the vapor pressure gradient between leaf and air.
57. Wind can increase transpiration because it:
Explanation: Wind maintains a steep gradient for water vapor diffusion.
58. Higher temperature often increases transpiration by:
Explanation: Warmer conditions enhance evaporation from mesophyll surfaces.
59. Cuticular transpiration is comparatively small because the cuticle is:
Explanation: The cuticle reduces direct water loss from epidermal surfaces.
60. Lenticular transpiration occurs through:
Explanation: Woody stems also lose small amounts of water vapor through lenticels.
61. A potometer is used to estimate:
Explanation: A potometer measures water uptake, which approximates transpiration.
62. Potometer does not directly measure transpiration because it measures:
Explanation: Some absorbed water is used internally, so uptake is only an indirect estimate.
63. A major advantage of transpiration is:
Explanation: Evaporation removes heat and cools the leaf surface.
64. Transpiration is called the main driving force of ascent of sap because it:
Explanation: Evaporation in leaves produces the pull that lifts water upward.
65. Transpiration is called a necessary evil because it:
Explanation: Plants need it for several physiological advantages despite the cost.
66. According to the potassium ion concept, stomata open when guard cells:
Explanation: K+ accumulation lowers guard cell water potential and draws in water.
67. A dry windy day promotes higher transpiration mainly because:
Explanation: Dry air and wind together enhance water vapor diffusion from the leaf.
68. Which adaptation reduces transpiration in xerophytes?
Explanation: Sunken stomata trap humid air and reduce vapor loss.
69. The largest fraction of transpiration is usually:
Explanation: Stomata account for most water vapor loss in most leaves.
70. The best summary of transpiration is:
Explanation: This captures both the usefulness and cost of transpiration.
71. The direct source of water vapor in transpiration is:
Explanation: Water evaporates from the moist walls of mesophyll cells into leaf air spaces.
72. Stomata usually close under drought because:
Explanation: Water stress and ABA promote guard cell flaccidity and closure.
73. Evaporation from leaf surfaces lowers water potential in:
Explanation: Lower mesophyll water potential helps draw water from xylem toward the leaf.
74. Which pair is correctly matched?
Explanation: Potometers estimate transpiration by tracking water uptake.
75. The strongest one-line revision is:
Explanation: This sentence captures the physiological core of the topic.
76. Food is transported in plants mainly through:
Explanation: Phloem translocates sugars and other organic solutes.
77. The major form of sugar translocated in phloem is:
Explanation: Sucrose is the common transport form of carbohydrate in many plants.
78. A mature photosynthesizing leaf is usually a:
Explanation: A source exports carbohydrates to other plant organs.
79. A developing fruit is usually a:
Explanation: A sink imports sugars for growth and storage.
80. The accepted mechanism for phloem transport is:
Explanation: Munch proposed pressure-driven translocation from source to sink.
81. The conducting elements of angiosperm phloem are:
Explanation: Sieve tube elements form the main conducting part of angiosperm phloem.
82. Sieve tube elements are closely associated with:
Explanation: Companion cells help with metabolism and loading-unloading functions.
83. Active loading of sucrose into phloem causes water to enter from:
Explanation: Water enters osmotically when sucrose loading increases phloem solute concentration.
84. At the sink, unloading of sucrose:
Explanation: Pressure remains higher at source and lower at sink, maintaining flow.
85. Phloem translocation requires energy mainly during:
Explanation: Loading and unloading often involve active transport steps.
86. Removal of bark in girdling mainly affects:
Explanation: Bark contains phloem, so ringing interrupts food transport.
87. Sugar accumulation above a ringed region proves that:
Explanation: Ringing blocks the downward phloem movement of photosynthates.
88. A storage tuber supplying food during sprouting functions as a:
Explanation: Stored carbohydrate is mobilized out of the tuber to growing tissues.
89. A young leaf generally behaves as a sink because it:
Explanation: Young leaves need imported assimilates until they mature.
90. Whole-plant phloem transport can be bidirectional because:
Explanation: Different conducting strands can support different transport directions.
91. Which structure is most directly involved in ATP-dependent sucrose loading?
Explanation: Companion cells and sieve elements use membrane transporters for loading.
92. Water and minerals move mainly through:
Explanation: This is the main long-distance pathway for inorganic transport.
93. The main long-distance pathway for organic solutes is:
Explanation: Organic nutrients are translocated by the phloem system.
94. Which pair is correctly matched?
Explanation: Sucrose is the main translocated carbohydrate in many plants.
95. The best summary of phloem transport is:
Explanation: This is the standard logic of the pressure-flow hypothesis.
96. Mineral ions move upward to leaves mostly with:
Explanation: Minerals are carried upward in xylem with water.
97. Mass flow in phloem is driven mainly by:
Explanation: Osmotically generated pressure differences drive phloem sap movement.
98. Xylem and phloem differ because xylem is mainly for:
Explanation: Phloem mainly transports organic solutes, while xylem carries water and minerals.
99. Which statement is correct?
Explanation: The two vascular tissues use distinct transport mechanisms.
100. The strongest summary of long-distance solute transport is:
Explanation: This is the most useful integrated revision statement.
101. Absorption of water by hydrophilic colloids is:
Explanation: Dry seeds and wood swell because of imbibition.
102. Initial swelling of dry seeds is mainly due to:
Explanation: Hydrophilic seed materials absorb water before active metabolism rises.
103. SPAC stands for:
Explanation: SPAC expresses the continuous pathway of water movement from soil to air.
104. The plant body functions as a hydraulic continuum because:
Explanation: SPAC integrates soil, plant, and air into one water pathway.
105. A wilted plant droops mainly due to loss of:
Explanation: Loss of turgidity reduces support in soft plant tissues.
106. Stomata usually close during severe water stress because:
Explanation: Loss of turgor in guard cells closes the stomatal pore.
107. A plant in moist soil may still wilt in hot dry weather if:
Explanation: Excess transpiration can outpace root uptake even when soil water is available.
108. Which event most directly links transpiration with ascent of sap?
Explanation: Leaf evaporation is the origin of the upward pulling force.
109. Which pair is correctly matched?
Explanation: A potometer tracks water uptake as an approximation of transpiration.
110. Guttation differs from transpiration because guttation releases:
Explanation: Guttation is exudation of liquid water droplets, unlike vapor loss in transpiration.
111. Bleeding from cut stems usually indicates the presence of:
Explanation: Positive root pressure can force xylem sap out of cut stems.
112. Imbibition is biologically important because it helps:
Explanation: Water uptake by dry seed tissues is an early step in germination.
113. Which statement is correct?
Explanation: Casparian strips block the apoplastic route and create selective entry.
114. Why is transpiration called a necessary evil?
Explanation: Plants gain benefits from transpiration despite the associated loss of water.
115. The main transport tissue for organic food is:
Explanation: Phloem is the principal tissue for translocation of food materials.
116. The main transport tissue for water is:
Explanation: Xylem forms the chief water-conducting pathway in vascular plants.
117. Which statement is correct?
Explanation: Water and food transport differ in tissue type and driving force.
118. Guard cell turgor is most directly related to:
Explanation: The opening or closing of stomata depends on guard cell turgidity.
119. The chapter's central idea is that:
Explanation: The chapter combines cell-level and whole-plant transport principles.
120. The strongest summary of Transport in Plants is:
Explanation: This one line integrates the full chapter structure.
121. Hydathodes are mainly associated with:
Explanation: Hydathodes release liquid water droplets under suitable conditions.
122. A source in phloem transport is an organ that:
Explanation: Sources are sugar-producing or sugar-releasing plant parts.
123. A sink in phloem transport is an organ that:
Explanation: Sinks consume or store translocated carbohydrates.
124. Which pair is correctly matched?
Explanation: Developing fruits import assimilates, so they behave as sinks.
125. The most useful final revision line is:
Explanation: This is the cleanest integrated summary for NEET revision.