1. Membrane protein is responsible for transport of
Correct : C. Active transport
2. The +ve value of Ψ P is called ..........
Correct : C. Turgor pressure
3. What happens in this figure ?
Correct : D. Cell remain in same condition
4. In older dying leaves to younger leaves the mineral ions are assimilated into .......... .
Correct : B. Organic compound
5. Which elements are readily mobilized in plants ?
Correct : C. P, S, N
6. In term of fixing CO2, C4 plants are .......... efficient as C3 plants.
Correct : B. Twice
7. When a cell is placed in 0.50M concentrated sugar solution, there is no change in it. So the external solution is called .......... .
Correct : B. Isotonic
8. The pressure that prevails in cell due to number of substances dissolved in cell sap is .......... .
Correct : C. Osmotic pressure
9. The plasmolysed cells regain turgidity and assume original volume under infuence of hypotonic solution. The process is called
Correct : B. Deplasmolysis
10. An animalcell placed in pure water will
Correct : A. Swell up and brust
11. Passage of water across a selectively permeable membrane is
Correct : D. Osmosis
12. Seeds placed in water imbibe the water becasue of
Correct : C. Lower Ψ W
13. In thistle funnel experiment, entry of water into thistle funnel stops after some time automatically due to
Correct : C. Development of hydrostatic pressure in the thistle funnel.
14. In plants the process in which loss of water occurs in form of water vapour is
Correct : C. Transpiration
15. Stomatal aperature is surrounded by guard cells and opens when guard cells are
Correct : B. Turgid
16. Stomatal frequency indicates.
Correct : A. Number of stomata per unit area
17. In dorsiventral leaf, the number of stomata per unit area are generally.
Correct : B. More on lower surface (epidermis)
18. In isobilateral leaf, the number of stomata per unit area are.
Correct : C. Approximately same on both the surfaces
19. The loss of water in form of water drops is called.
Correct : C. Guttation
20. Transpiration is unavoidable evil because of
Correct : D. Gaseous exchange for photosynthesis and respiration
21. Plants with scotoactive stomata perform
Correct : B. CAM photosynthesis
22. For keeping stomata open, besides K+ ions the guard cells require a constant supply of
Correct : B. ATP
23. Transpiration is a process related to
Correct : B. Diffusion
24. Rate of transpiration is inversely related to
Correct : A. Humidity
25. Scotoactive movement of stomata is that
Correct : A. Stomata open at night
26. The most effective light for stomatal opening is_____________
Correct : D. Blue
27. During high wind velocity, the stomata
Correct : B. Close down
28. Cobalt chloride is blue in dry state. In contact with moisture, it turns in to
Correct : B. Pink
29. The maximum absorption of water by roots occurs in the (region) zone of
Correct : D. Root hairs
30. The movement of water is along
Correct : B. DPD gradient
31. As absorbed water passes towards vascular cylinder, it must enter the cytoplasm of
Correct : B. Endodermal cells
32. Water tightly held to soil particles is called (EAMCET 1996)
Correct : C. Hygroscopic water
33. The phenomenon which forces water upward into tracheal elements of xylem in the root region is
Correct : B. Root pressure
34. Force for passive water absorption develops in
Correct : B. Aerial parts
35. The phenomenon related to active water absorption is
Correct : B. Root pressure
36. Root pressure can be demonstrated by means of
Correct : D. Exudation
37. Root pressure theory of ascent of sap is unacceptable because
Correct : A. Water can ascend without root or root pressure
38. Transpiration cohesion theory explains that the upwards pull of water is transmitted from top to bottom by cohesion of molecules caused by
Correct : B. Hydrogen bonds
39. Root pressure is unable to explain the ascent of sap because it is not found in
Correct : A. Bryophyte
40. Ascent of sap is
Correct : D. Redistribution of inorganic substances in the plant
41. In xylem, the ascent of sap takes place in
Correct : B. Xylem parenchyma
42. Swelling of wooden frames during rains is caused by
Correct : A. Endo osmosi
43. Dry seeds when placed in waeter swell up due to
Correct : B. Absorption
44. A cell is plasmolysed after being kept in hypertonic solution. What will be present between cell wall and plasmalemma ?
Correct : D. Hypotonic solution
45. Raisins placed in water swell up due to (CPMT 1988, KCET 2008)
Correct : C. Diffusio
46. Root hairs absorb water from soil when (AFMC 1988, JIPMER 1986)
Correct : D. Absorption is active
47. A cell placed in strong salt solution will shrink because (JIPMER 1986)
Correct : A. Cytoplasm will decompose
48. Osmosis defined as
Correct : A. Flow of solvent (water) through a semipermiable membrane from less concentrated solution to more concentrated solution.
49. A cell increase in volume if the external medium is (Har. PMT 2005)
Correct : A. Hypotonic
50. If a cell gets reduced in size when placed in solution, the solution is (CPMT 1988, AFMC 2009)
Correct : A. Hypertonic
51. In a hypertonic solution a cell’s water potential
Correct : A. Decrease
52. An example of selectively permeable membrane is (CPMT 1988)
Correct : B. Cell wall
53. When beet root cylinders are washed and then placed in cold water, anthocyanin does not come
out. This indicates that most likely the plasma membrane is (AFMC 1990)
Correct : D. Dead structure
54. Water potential is equal to (CBSE 1988, AMV 1997)
Correct : D. Ψ P + Ψ W
55. Purple cabbage leaves do not pass out colour in cold water but do so in hot water becasue (AFMC 1988)
Correct : A. Hot water enters the cell faster
56. Which one option does not involve osmosis ? (MPPMT 1991)
Correct : B. Water passing from soil to root hair
57. A bottle filled with previously moistened mustard seeds and water was screw capped tightly and
kept in a corner. It blew up suddenly after about half an hour. The phenomenon involved is
Correct : B. Imbibition
58. When concentration of solutes is low in the soil, absorption of water is (CMPT 1987, KCET 2007)
Correct : D. Normal
59. Guard cells differ from epidermal cells in having. (CPMT 1993, CBSE 2011)
Correct : B. Vacuoles
60. Wilting in plants occurs when (CPMT 1987, 1991, 2002, AFMC 2005, BHU 2006, WB 2008)
Correct : B. Xylem is removed / blocked
61. Guttation is the process of elimination of water from plants through
(BHU 1986, JIPMER 1987, MPPMT 1995, Orissa 2003)
Correct : D. Wounds
62. What is the action spectrum of transpiration ? (RPMT 1995, CET Chd. 2006)
Correct : A. Green and ultraviolet
63. Stomata open during day time because the guard cells (CPMT 1987)
Correct : D. Have to help in gaseous exchange
64. Stomatal opening is under the control of (KCET 1988, Manipur 2005)
Correct : B. Pallisde cells
65. Maximum transpiration takes place from
Correct : B. Leaves
66. It is produced during water stress that brings stomatal closure. (AMU 1992, CBSE 1993, 1994, 2001, RPMT 2000, JIPMER 2000, Orissa 2009, MP PMt 1992)
Correct : D. Coumarin
67. Transpiration is least in (CBSE 1998, BHU, 1987, KCET 2006)
Correct : C. Dry environment
68. Transpiration is high in (MP PMT 1993)
Correct : D. Low wind velocity
69. Potometer is an instrument that measures (Pb. PMT 1998, Manipur 2005)
Correct : D. Transpiration
70. Wilting appears due to excessive. (MP PMT 1989, RPMT 2000, AFMC 2001, Pb. PMT 2001)
Correct : A. Respiration
71. Transpiration is regulated by movement of (JIMER 2004)
Correct : B. Subsidiary cells
72. Rate of transpiration is reduced with (CPMT 1987, MPPMT 1999)
Correct : B. Decrease in light intensity
73. In terrestrial habitats, temperature and railfall conditions are influenced by (CBSE 1989)
Correct : A. Water transformation
74. Conversion of starch to organic acids is required for (CBSE 1992)
Correct : C. Stomatal formation
75. Element involved in stomatal regulation its opening and closing is(CPMT 1989, 2004, Kerala 2000, Manipal 2001, Pb. PMT 2001, Uttrakhant 2001, DPMT 2002, Wardha 2003, 2011, AMU 2005)
Correct : A. Zinc
76. In guard cells when sugar is converted into starch, the stomatal pore (CBSE 1997)
Correct : A. Closed completely
77. Water will be absorbed by root hairs when the externael medium is
(JIPMER 1986, AFMC 1993)
Correct : C. Isotonic
78. Root hairs occur in the zone of (Kerala 2003)
Correct : C. Cell maturatio
79. Path of water movement from soil to xylem is (CPMT 1989, Kerala 2008)
Correct : C. Soil - root hair - cortex - endodermis - pericycle - protoxylem - meta xylem
80. Water in plants is transported by or ascent of sap takes place through (BHU 1991, DPMT 1987, CPMT 1983, 1996, MHTCET 2009)
Correct : A. Cambium
81. Water rises in the stem due to (RPMT 2000)
Correct : C. Osmotic pressure
82. The principal pathway of water translocation in angiospermis is (CBSE 1990)
Correct : B. Sieve tube elements
83. Which contributes most to the transport of water from soil to the leaves of a tree ? (CPMT 1989, MPPMT 1989)
Correct : D. Hydrolysis of ATP
84. Cohesive force of water is due to (EAMCET 1989, EPMT 2005)
Correct : C. S-bonds
85. Diffusion of water through selectively permeable membrane is (CPMT 1993)
Correct : C. Osmosis
86. A higher plant cell covered with cutin and suberin is placed in water, after 15 minutes, the cell (BHU 1993)
Correct : D. Size will decrease
87. Plant cell kept in hypertonic solution will get (MPPMT 1994)
Correct : B. Turgid
88. The movement of free atoms from higher concentration to lower concentration is called. (RPMT 1995)
Correct : A. Osmosi
89. Plasmolysis is due to (CPMT 1995)
Correct : C. Osmosis
90. Cotton fibres dipped in water absorb water through (RPMT 1996)
Correct : B. Exosmosis
91. With rise in turgidity, wall pressure will (CBSE 1997)
Correct : A. Decrease
92. Root pressur is due to (MPPMT 1993, Har. PMT 2003, Orissa 2011)
Correct : D. Increased photosynthesis
93. Adding solute to pure water will cause development of (MPPMT 2001)
Correct : A. Positive water potential
94. Rate of transpiration is highest when (JKCMEE 2000)
Correct : C. Soil is dry and air is humid
95. Stomata of CAM plants (CBSE 2003)
Correct : A. Are always open
96. Choose the correct combination of labelling in potato osmoscope. (Manipal PMT 2004)