NEET Biology Chapter Wise Mock Test – Transport in Plants
1. The rate of diffusion is dependent upon the permeability of that medium, it however
(a) influences the final equilibrium of diffusion as it is never reached if the medium is dense
(b) does influence the final equilibrium of diffusion
(c) does not influence the final equilibrium of diffusion
(d) None of the above
2. When a cell is fully turgid, which of the following will be zero?
(a) Turgor pressure/pressure potential
(b) Wall pressure
(c) Suction pressure/DPD/water potential
(d) Osmotic pressure (solute pressure)
3. Water potential is equal to
4. Water passes into a cell due to
(a) OP
(b) DPD
(c) WP
(d) diffusion
5. Water potential found in root hair cells is generally
(a) 1 -2 atm
(b) -1 to 2.0 atm
(c) -1 to 4 atm
(d) -1 to -4 atm
6. The chemical potential, of pure water is regarded as
(a) one
(b) infinite
(c) zero
(d) more than one
7. The water potential of an aqueous solution is
(a) zero
(b) more than one
(c) less than one
(d) infinite
8. Water potential in the leaf tissue is positive (+) during
(a) excessive transpiration
(b) low transpiration
(c) excessive absorption
(d) guttation
9. The water potential is
(a) equal in soil and atmosphere
(b) lowest in soil and highest in atmosphere
(c) highest in soil and lowest in atmosphere
(d) non-existent at both the places (soil and atmosphere)
10. Mark the correct answer.
(a) in solutions, the value of water potential is considered to be negative
(b) in solutions, the value of water potential is always considered to be positive
(c) in solutions, the value of water potential may be positive or negative
(d) in solutions, the value of water potential is zero
11. Which of the following has the highest water potential?
(a) 1M salt solution
(b) 1M sugar solution
(c) Distilled water
(d) 1M sugar solution with 2-3 bars pressure applied to it
12. When certain solute particles are added to the presolvent, the diffusion pressure of the resulting solution is lowered by an amount expressed in terms of
(a) Turgor Pressure (TP)
(b) Diffusion Pressure (DP)
(c) Osmotic Pressure (OP)
(d) Diffusion Pressure Deficit (DPD)
13. Mark the correct relationship
14. Which is true of a fully turgid cells?
(a) OP = DPD
(b) OP = Zero
(c) DPD = Zero
(d) TP = Zero
15. In a flaccid cell
(a) DPD = OP
(b)DPD= TP
(c) TP = OP
(d)OP= 0
16. In a plant cell, OP is equal to
(a) TP-DPD
(b) DPD-TP
(c) TP – DP
(d) DPD + TP
17. Osmosis is a passage of
(a) solute from a semipermeable membrane
(b) water or solvent without a membrane ,
(c) solution through a permeable membrane
(d) solvent through a semipermeable membrane from a less concentrated solution to a more concentrated solution
18. The process of selective passage across a semipermeable membrane is
(a) diffusion
(b) osmosis
(c) capillarity
(d) imbibition
19. The process of movement of solvent from its higher chemical potential to its lower chemical potential (without allowing the diffusion of solute) through semipermeable membrane is known as
(a) independent diffusion
(b) diffusion
(c) osmosis
(d) exosmosis
20. Selectively (differentially) permeable membrane is that which allows
(a) all the solute particles to pass through it
(b) none of the solute particles to pass through it
(c) some of the solute particles to pass through it and prevents others
(d) all the solute particles to pass through it in the beginning for 5-10 minutes, then the rate declines
21. During osmosis, water moves through a semipermeable membrane
22. Osmosis is the diffusion of a solution of a weaker concentration, when both are separated by semipermeable membrane. What is the error in the statement?
(a) The movement of water molecules is not specified
(b) There is no mention of DPD
(c) Behaviour of semipermeable membrane
(d) The exact concentrations are not indicated
23. Which is possible for a fully turgid cell?
(a) DPD = 10 atm, OP = 15 atm, TP = 5 atm
(b) DPD = 0.2 atm, OP = 0.7 atm, TP = 0.5 atm
(c) DPD = 0.0 atm, OP = 15 atm, TP = 15 atm
(d) DPD = 5 atm, OP = 12 atm, TP = 7 atm
24. Osmotic pressure in a vacuolated plant cell is
(a) equal to WP
(b) equal to TP
(c) more than DPD
(d) less than DPD
25. Two cells A and B are contiguous. Cell A has osmotic pressure 10 atm, turgor pressure 7 atm and diffusion pressure deficit 3 atm. Cell B has osmotic pressure 8 atm, turgor pressure 3 atm and diffusion pressure deficit 5 atm. The result will be
(a) movement of water from cell B to A
(b) no movement of water
(c) equilibrium between the two
(d) movement of water from cell A to B
26. A solution, which can cause osmotic entry of water, into it, is known as
(a) hypertonic solution
(b) semi-osmotic solution
(c) osmotically active solution
(d) osmotic solution
27. In modern terminology, the value of osmotic potential is
(a) positive
(b) negative
(c) zero
(d) None of these
28. The value of osmotic potential of an electrolyte is always
(a) more than non-electrolyte
(b) less than non-electrolyte
(c) same as non-electrolyte
(d) None of these
29. Osmotic pressure is responsible for the turgidity of plant cells, which
(a) causes cell elongation
(b) causes opening of stomata
(c) prevents wilting of leaves
(d) causes all the three above
30. The cell A has an osmotic potential of -20 bars and a pressure potential of +6 bars. What will be its water potential?
(a) -14 bar
(b) +14 bars
(c) -20 bars
(d) +20 bars
31. A 10% solution, of which of the following substances shall have maximum OP?
(a) NaCI
(b) Sucrose
(c) Glucose
(d) Fructose
32. Which of the following changes in the cell sap of the guard cells are responsible for keeping the stomata open during day time?
(a) Increase in the osmotic pressure, but decrease in turgor pressure
(b) Decrease in the osmotic pressure, but increase in turgor pressure
(c) Increase in both osmotic and turgor pressure
(d) Decrease in both osmotic and turgor pressure
33. Mark the correct statement.
(a) The value of TP becomes zero at the time of limiting plasmolysis and below zero during incipient and evident plasmolysis
(b) The value of TP becomes below zero at the time of limiting plasmolysis and zero at the time of incipient and evident plasmolysis
(c) The value of TP remains same at the time of limiting, incipient and evident plasmolysis
(d) The value of TP becomes negative in all the stages of plasmolysis
34. The turgor pressure becomes negative, when
(a) most of the cell water has been withdrawn
(b) the cell is in the stage of incipient plasmolysis
(c) the cell is in the stage of limiting plasmolysis
(d) when cell is placed in isotonic solution
35. The value of osmotic pressure becomes equal to turgor pressure, when a cell is placed in a
(a) hypertonic solution
(b) hypotonic solution
(c) isotonic solution
(d) Both (a) and (b)
36. In an osmoscope of fresh and peeled potato, concentrated sugar solution is filled in the cup. It is then placed in a petridish, containing water with a few drops of safranin. It shows
(a) endosmosis, inner solution becomes pink
(b) endosmosis, inner solution does not become pink
(c) exosmosis, the cup becomes empty
(d) no osmotic phenomenon is observed
37. The OP and TP of two pairs of cells A-B and X-Y are as under,
The net movement of water shall be from
(a) A-B and X-Y
(b) A-B and Y-X
(c) B-A and X-Y
(d) B-A and Y-X
38. Water will be absorbed by root hair, when the external medium is
(a) hypotonic
(b) hypertonic
(c) isotonic
(d) viscous
39. The shrinkage of the protoplast of a cell, from its cell wall under the influence of a hypertonic solution, is known as
(a) endosmosis
(b) exosmosis
(c) plasmolysis
(d) deplasmolysis
40. The regaining of turgidity, by a protoplast under the influence of hypotonic solution, is known as
(a) deplasmolysis
(b) plasmolysis
(c) exosmosis
(d) endosmosis
41. When a fresh piece of potato is placed in a concentrated solution, it will
(a) swell up
(b) remain as such
(c) shrink
(d) die
42. Bacteria cannot survive in a highly salted pickle because
(a) salt inhibits reproduction
(b) bacteria do not get enough light for photosynthesis
(c) they become plasmolysed and consequently killed
(d) the pickle does not contain nutrients necessary for bacteria to live
43. At incipient plasmolysis, water potential (yw) is equal to
44. A cell placed in hypertonic solution shows shrinkage of its protoplasm due to the
(a) plasmolysis
(b) endosmosis
(c) osmosis
(d) imbibition
45. Purple cabbage leaves do not pass out colour in cold water but do so in hot water because
(a) hot water enters the cell faster
(b) pigment is not soluble in cold water .
(c) hot water destroys the cell walls
(d) hot water kills plasmalemma and makes it permeable
46. Mark the correct statement
(a) transpiration is influenced by both physical and physiological processes
(b) transpiration is influenced by only environmental conditions
(c) transpiration depends upon the absorption of water
(d) transpiration continues day and night in all plants
47. An innovative professor, who wanted to give a live demonstration of a physiological process, filled a glass bottle up to neck with previously moistened mustard seeds, screw-capped the bottle and kept it away in corner and resumed his lecture. Towards the end of his lecture, there was a sudden explosion with glass pieces of the bottle thrown around. Which of the following phenomenon did the professor wanted to demonstrate?
(a) Diffusion
(b) Anaerobic respiration
(c) Osmosis
(d) Imbibition
48. Resurrection plants like Selaginella and lichens remain air dry for considerable periods because they can absorb water from the slight downpour. By which physiological process, water is absorbed?
(a) Active absorption
(b) Passive absorption
(c) Imbibition
(d) Osmosis
49. Tick the correct statement.
(a) The closely packed imbibant will imbibe less water than the loosely packed one
(b) The closely packed imbibant will imbibe more water than the loosely packed one
(c) both will imbibe the same amount of water
(d) The amount of water absorbed by closely packed and loosely packed imbibant will depend upon the temperature of the medium
50. Which of the following is an example of imbibition?
(a) Uptake of water by root hair
(b) Exchange of gases in stomata
(c) Swelling of seeds when put in soil
(d) Opening of stomata
51. At the time of seed germination, when water is absorbed by the seeds due to the imbibition, the seed coat breaks as it swells to a lesser degree than the kernel because
(a) the kernel is made up of proteins, lipids and starch while, the seed coat is formed of cellulose
(b) the kernel is made up of cellulose, while the seed coat is made up of proteins, lipids and starch
(c) both kernel and seed coat are made up of same constituents, it depends on the nature of medium
(d) None of the above
52. The retaining of water on the surface of root is due to
(a) the presence of cellulose on the outer part of wall
(b) the presence of pectic compounds on the outer part of the cell wall
(c) the presence of both cellulose and pectic compounds on the outer part of the cell wall
(d) the presence of lignin and pectin on the outer part of the cell wall
53. For the process of absorption of water, the root hair act as
(a) osmotic system
(b) sucking organs
(c) capillary system
(d) imbibitional system
54. Water from soil enters into the root hair on account of
(a) osmotic pressure
(b) turgor pressure
(c) suction pressure
(d) atmospheric pressure
55. The active absorption of water that does not require a direct supply of energy, is known as
(a) electro osmotic active absorption
(b) passive water absorption
(c) osmotic active absorption
(d) non-osmotic active absorption
56. During passive absorption, water is absorbed by the root hair due to increased
(a) turgor pressure
(b) suction pressure
(c) osmotic pressure
(d) wall pressure
57. During absorption of water by the roots, the water potential of cell sap is lower than that of
(a) pure water as well as soil solution
(b) neither pure water nor soil solution
(c) pure water but higher than soil water
(d) soil water but higher than pure water
58. In which type of absorption, metabolic energy is required and roots play, a positive role of absorbing water in
(a) active absorption
(b) passive absorption
(c) Both (a) and (b)
(d) None of the above
59. The active absorption takes place by
(a) transpiration pull
(b) imbibition
(c) osmotic concentration of cell
(d) osmotic pressure
60. Which of the following statements does not apply to reverse osmosis?
(a) It is used for water purification
(b) In this technique, pressure greater than osmotic pressure is applied to the system
(c) It is a passive process
(d) It is an active process
61. Electrosmotic theory of water’ transport was proposed by
(a) Blinks
(b) Bennet Clark
(c) Fensom
(d) Keller
62. At field capacity, the soil contains the following
(a) capillary and run away water only
(b) capillary and hygroscopic water only
(c) capillary and gravitational water only
(d) capillary, hygroscopic and combined water
63. Mark the false statement for water in cell
(a) it provides energy
(b) acts as a solvent
(c) it provides H+ion during chemical activities
(d) it provides medium during chemical reactions
64. Which one does not involve osmosis?
(a) Water passing from one xylem element to other above it
(b) Water passing from soil to root hair
(c) Water passing from root hair cell to cortical cell
(d) Water passing into mesophyll cell from xylem
65. The movement of water from one cell of the cortex to the adjacent one in roots, is due to the
(a) accumulation of inorganic salts in the cells
(b) accumulation of organic compounds in the cells
(c) chemical potential gradient
(d) water potential gradient
66. Path of water movement from soil to xylem is
(a) Metaxylem ->Protoxylem ->Cortex Soil -> Root hair
(b) Cortex -> Root hair -> Endodermis ->Pericycle ->Protoxylem -> Metaxylem
(c) Soil -> Root hair ->Cortex -> Endodermis -> Pericycle -> Protoxylem -> Metaxylem
(d) Pericycle ->Soil ->Root hair -> Cortex -> Endodermis ->Protoxylem -> Metaxylem
67. Root pressure is maximum, when
(a) transpiration is high and absorption low
(b) transpiration is very low and absorption high
(c) transpiration and absorption both are high
(d) transpiration and absorption both are low
68. Root pressure which plays a small role in xylem flow, is caused by
(a) transpiration of water out of the xylem
(b) cohesion of water molecules to one another
(c) adhesion of water molecules to walls of the xylem
(d) osmotic flow of water in the xylem
69. The most accepted theory for ascent of sap is
(a) transpiration pull and cohesion tension theory of Dixon and Jolly
(b) pulsating action of living cell
(c) role of atmospheric pressure
(d) de Vries cytoplasmic streaming theory
70. Rising column of water does not break convection in the xylem vessels despite negative pressure or tension due to
(a) cohesion amongst water molecules
(b) strong transpiration molecule
(c) adhesion
(d) surface tension
71. When chemical fertilisers are supplied to a plant without supplying sufficient water, the plant shows wilting because
(a) the plant cannot absorb the fertilisers
(b) the plant absorbs more fertilisers
(c) of plasmolysis occurring in root cells
(d) the fertiliser absorbs all available water in the soil
72. According to the transpiration-cohesion theory, water is pulled upward through the xylem. The cause of the pull is
(a) guttation
(b) root pressure
(c) transpiration
(d) condensation
73. No transpiration occurs from the upper surface of leaf in Hedera helix while, about 30% of the transpiration occurred from the upper surface of leaf in Tilia europea in same conditions. This is due to the fact that
(a) walls of epidermal cells and cuticle are thick in Hedera helix and thin in Tilia europea
(b) due to difference in the number of stomata
(c) due to difference in the number of lenticels
(d) due to difference in the structure of stomata
74. Generally, the loss of water through stomata in most of the plants is
(a) 20-50%
(b) 30-50%
(c) 50-88%
(d) 50-97%
75. When stomata remains open throughout the day and night, they are called
(a) alfa-alfa type
(b) potato type
(c) barley type
(d) Equisetum type
76. The lower surface stomata in
(a) dorsiventral leaf
(b) Isobilateral leaf
(c) Both (a) and (b)
(d) None of these
77.In water stressed Water potential in leaf tissue, is positive (near zero) during plants
(a) low transpiration
(b) excessive absorption
(c) excessive transpiration
(d) guttation
78. Wilting occurs, when
(a) rate of transpiration is higher than absorption
(b) rate of absorption is higher than transpiration
(c) root pressure is very high
(d) relative humidity in air is very high
79. A twig partly dipped in water having some salts remains fresh for longer period, due to
(a) exosmosis
(b) decrease in transpiration
(c) increase in water absorption
(d) decrease in bacterial degradation
80. When a plant wilts, what will be the sequence of events?
(a) Endosmosis, plasmolysis, temporary and permanent wilting
(b) Exosmosis, plasmolysis, temporary and permanent wilting
(c) Exosmosis, deplasmolysis, temporary and permanent wilting
(d) Exosmosis, plasmolysis, deplasmolysis temporary and permanent wilting
81. Starch-sugar inter conversion hypothesis, was proposed by
(a) Levitt
(b) Sayere and Steward
(c) Sachs
(d) Emerson
82. The primary osmolite, which causes an opening and closing of stomata is
(a) sugars
(b) starch
(c) K-malate
(d) water
83. Which of the following is produced during water stress and causes closure of stomata?
(a) Cytokinin
(b) ABA
(c) GA3
(d) Auxin
84. Potometer, works on the principle of
(a) amount of water absorbed equals to the amount transpired
(b) osmotic pressure
(c) root pressure
(d) potential difference between the tip of the tube and that of the plant
85. The process which is carried by hydathodes
(a) photosynthesis
(b) imbibition
(c) guttation .
(d) turgor pressure maintenance
86. The food stored in the ripening fruit is derived from
(a) maltose
(b) sucrose
(c) glucose
(d) starch
87. pH of phloem sap is
(a) 8.7-9.6
(B) 7.5-8.6
(c) 5.0-6.0
(d) 2.4-0.8
88. The movement of solutes in the phloem is mainly
(a) acropetal
(b) lateral
(c) basipetal
(d) lateral-acropetal
89. Which of the following trees would die quicker?
(a) Hollow-heated
(b) Girdled
(c) Deciduous
(d) Pruned
Direction (Q. Nos. 91-98) In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it, Of the statements, mark the correct answer as
(a) If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
(b) If both Assertion and Reason are true, but Reason is not the correct explanation of Assertion.
(c) If Assertion is true, but Reason is false.
(d) If both Assertion and Reason are false.
90. Assertion When a plant cell is placed in hypertonic solution, exosmosis occurs.
Reason The osmotic concentration of hypertonic solution is higher than that of cell sap.
91. Assertion In fully turgid cell, OP = TP.
Reason In fully plasmolysed cell, TP= 0
92. Assertion The absorption of water by the solid particles of an absorbant without forming a solution is known as imbibition.
Reason The liquid which is imbibed, is known as imbibate,
93. Assertion The plant imbibants are hydrophilic colloids.
Reason The plant imbibants have highly negative water potential.
94. Assertion The chemical potential of pure water, at normal temperature and pressure is zero.
Reason In solution, value of water potential is always positive.
95. Assertion Loss of water produces a negative hydrostatic pressure.
Reason Negative hydrostatic pressure is found in xylem.
96. Assertion Ernst Munch (1930) first proposed mass or pressure flow theory.
Reason Phloem loading is an active transpprt mechanism.
97. Assertion The phloem sap contains mainly water and sucrose.
Reason Phloem mainly carries food in the’ form of glucose.
99. Match the following columns.
Codes
A B C D
(a) 2 1 5 4 .
(b) 4 5 1 2
(c) 1 2 3 4
(d) 5 4 2 1
100.Match the following columns
Codes
A B C D
(a) 4 3 5 1
(b) 2 3 4 5
(c) 5 4 2 1
(d) 1 2 4 5
101. Transpiration and root pressure cause water to rise in
plants by
(a) pulling it upward
(b) pulling and pushing it, respectively
(c) pushing it upward
(d) pushing and pulling it, respectively
102. In a ring girdled plant
(a) the shoot dies first
(b) the root dies first
(c) the shoot and root die together
(d) Neither root nor shoot will die
103. Which one gives the most valid and recent explanation for stomatal movements?
(a) Transpiration
(b) Potassium influx and efflux
(c) Starch hydrolysis
(d) Guard cell photosynthesis
104. Roots play insignificant role in absorption of water in
(a) sunflower
(b) Pistia
(c) pea
(d) wheat
105. Root pressure develops due to
(a) active absorption
(b) low osmotic potential in soil
(c) passive absorption
(d) increase in transpiration .
106. A column water within xylem vessels of tall trees does not break under its weight because of
(a) dissolved sugars in water
(b) tensile strength of water
(c) lignification of xylem vessels
(d) positive root pressure
107. Which of the following criteria does not pertain to facilitated transport?
(a) High selectivity
(b) Transport saturation
(c) Uphill transport
(d) Requirement of special membrane protein
108. Translocation of sugars in flowering plants occur in the form of
(a) glucose
(b) starch
(c) sucrose
(d) maltose
109. Translocation of photosynthetic end products in sieve tubes is
(a) 3-5 mm/h
(b) 3-5 cm/h
(c) 1-15 cm/h
(d) 60-100 cm/h
110. The chief water conducting elements of xylem in gymnosperms are
(a) vessels
(b) fibres
(c) transfusion tissue
(d) tracheids
Answers :