MCQS FOR PRACTICE
CHAPTER :- PLANT WATER RELATIONS
1. Wilting in plants occurs due to :
a) Blockage of xylem
b) Blockage of phloem
c) Both ‘a’ and ‘b’
d) Increased transpiration
2. If water enters in a cell, the pressure exerted by its swollen protoplast is :
a) Turgor pressure b) DPD
c) Osmotic pressure d) Imbition
3. Solution outside the cell has higher concentration than cytoplasm. Then the solution is:
a) Isotonic b) Hypotonic
c) Acidic d) Hypertonic
4. Process of water coming out from specific holes in margins is:
a) Photosynthesis b) Guttation
c) Transpiration d) Bleeding
5. The rate of transpiration in plants is dependent upon :
a) Temperature and soil
b) Light and temperature
c) Wind, temperature and light
d) Light, temperature, atmospheric humidity and wind.
6. When a cell is full turgid, which of the following will be zero ?
a) Wall pressure b) Osmotic pressure
c) Turgor pressure d) Water potential
7. Which of the following does not have stomata ?
a) Hydrophytes b) Mesophytes
c) Xerophytes
d) Submerged hydrophytes
8. Plant wilt due to excess of :
a) Transpiration b) Photosynthesis
c) Absorption d) None of above
9. Which of the following is not performed by root hairs ?
a) Water uptake
b) Oxygen uptake
c) Mineral uptake
d) CO2 uptake
10. When water enters the roots due to diffusion, it is termed as :
a) Osmosis b) Endocytosis
c) Active absorption
d) Passive absorption
11. Most of the water, transpiration in mature cells, occurs chiefly in which of the following?
a) Nucleus b) Cell wall
c) Vacuole d) Cytoplasm
12. Loss of water from the tips of leaves is called :
a) Guttation b) Transpiration
c) Respiration d) Bleeding
13. In submerged plants, the stomata lie on :
a) Upper surface b) Lower surface
c) Not on any surface
d) Equally on both surfaces
14. Outer layer of vocuole is called:
a) Cell wall b) Tonoplast
c) Plasmolayer d) Leucoplast
15. Stomata of CAM plants :
a) Never open b) Are always open
c) Open during the day and close at night
d) Open during the night and close at day
16. Stomata are open due to :
a) Influx of calcium ions
b) Influx of potassium ions
c) Efflux of potassium ions
d) Influx of hydrogen ions
17. Opening and closing of stomata is due to the
a) Hormonal changes in guard cells
b) Change in turgor pressure of guard cells
c) Gaseous exchange
d) Respiration
18. When water moves through a semipermeable membrane then which of the following pressure develops?
a) O.P. b) T.P. c) S.P. d) W.P.
19. Glycolate induces opening of stomata in:
a) Presence of O2
b) Low CO2 concentration
c) High CO2 d) CO2 absent
20. In soil, water available for plants is :
a) Capillary water
b) Hygroscopic water
c) Gravitational water
d) Chemical bound water
21. Water potential of actively absorbing cells is:
a) Always +ve b) Always –ve
c) Always 0 d) Always > 1
22. The osmotic potential and water potential of pure water is :
a) 100 and zero b) Zero and zero
c) 100 and 100 d) Zero and 100
23. O.P. in the leaf cells is positive during:
a) Excessive transpiration
b) Low transpiration
c) Excessive absorption d) Guttation
24. If turgidity of a cell surrounded by water increases, the wall pressure will:
a) Increase b) Decrease
c) Fluctuate d) Remain unchanged
25. Wilting occurs when :
a) Rate of transpiration is higher than absorption
b) Rate of absorption is higher than transpiration
c) Excess root pressure
d) High relative humidity in air.
26. The continuity of protoplasm from cell to cell is maintained through:
a) Vessels b) Stomata
c) Plasmodesmata d) Tracheids
27. The reals force responsible for the movement of water, from one cell to other cell, is called :
a) O.P. b) T.P. c) D.P.D. d) Imbition
28. A root hair is derived from :
a) Cortial cell b) Epidermal cell
c) Pericycle cell d) Endodermal cell
29. Widely accepted theory for the ascent of sap is :
a) Imbibition theory
b) Capillary theory
c) Negative tension theory
d) Cohesion tension theory
30. Osmosis is :
a) Diffusion of solvent
b) Imbibition of solution
c) Diffusion of solute
d) Evaporation of water
31. Seed increases in its volume by the absorption of water through a phenomenon called:
a) Diffusion b) Plasmolysis
c) Imbibition d) Active absorption
32. The O.P. of cell sap is more in :
a) Mesophytes b) Xerophytes
c) Hydrophytes d) Halophytes
33. To initiate cell plasmolysis, the salt solution should be:
a) Isotonic b) Hypertonic
c) Hypotonic d) Electrolysed
34. Hydrophonics means growing plants in:
a) Water b) Green house
c) Liquid
d) Solution of necessary nutrient
35. A plasmolysed cell can be deplasmolysed by placing it in :
a) Isotonic solution
b) Saturated solution
c) Either a or b
d) Pure ater or hypotonic solution
36. Maximum water loss occurs through:
a) Stomata b) Lenticels
c) Hydathodes d) Cuticle
37. An internal factor in transpiration is
a) CO2 b) N2 c) O2 d) Stomata
38. Barometer is used for measuring :
a) Soil water tension
b) Relative size of stomata
c) Transpiration
d) Atmospheric pressure
39. The rate of transpiration increases by:
a) High humidity
b) High temperature
c) Wetness in soil
d) Low wind velocity
40. In a free floating plant the stomata are:
a) Absent
b) Present on upper surface
c) Present on lower surface
d) Present on both surfaces
41. When stomata open, the pH of guard cells:
a) Increase b) Decrease
c) Remains same
d) First increase then decrease
42. The term osmosis refers to the diffusion of movement of :
a) Solute through a semipermeable membrane
b) Solvent through a semipermeable membrane
c) Solution through a semipermeable membrane
d) None of these
43. A thin film of water, held by the soil particles under the influence of internal attractive force, is called :
a) Capillary water
b) Combined water
c) Hygroscopic water
d) Gravitational water
44. The cohesive force existing between molecules of water contribtes to :
a) Osmosis b) Translocation
c) Plasmolysis d) Ascent of sap
45. Cohesion-tension theory was given by :
a) J.C. Bose b) Godlewski
c) Steward d) Dixon and Jolly
46. Priestly proposed :
a) Osmotic theory
b) Root pressure theory
c) Capillarity theory
d) Non-osmotic theory
47. Water absorbed by roots reach the top of the tall tree by :
a) Root pressure b) Imbition
c) Capillary force
d) Cohesion and transpiration pull
48. ‘Transpiration is necessary evil’ was given by :
a) Steward b) Levitt
c) Fungino d) Curtis
49. In water absorption the root cap does not play any role because :
a) It has loosely arranged cells
b) It has no connection with xylem
c) It has no chloroplast in its cells
d) It has not root hairs
50. Water at field capacity contains:
a) Capillary water and run away water
b) Capillary water, combined water, hygroscopic water
c) Capillary and gravitational water
d) Capillary and hygroscopic water
51. For absorption of water optimum temperature ranges between :
a) 20–300 C b) 10–150 C
c) 30–400 C d) 15–200 C
52. The term root pressure was coined by:
a) Priestly b) Stephan Hales
c) Dixon d) Jolly
53. Root pressure is absent in :
a) Halophytes b) Palms
c) Gymnosperms d) Legumes
54. pH controlled interconversion of starch and sugar was proposed by :
a) Steward b) Sayer
c) Fugino d) Levitt
55. The diameter of stomatal pore is:
a) 20-25 m b) 1-2 m
c) 15-25 m d) 3-10 m
56. ......... wall of guard cells are thick:
a) Outer b) Inner
c) Radial d) Both ‘a’ and ‘b’
57. Stomatal transpiration in plants is completely stopped during:
a) Evening b) Night
c) Morning
d) Both morning and evening
58. In most plants stomata :
a) are present more on the lower surface
b) are present more on the upper surface
c) are equally present on both the surface
d) are absent
59. In plants the process of transpiration help in
a) Absorption of O2
b) Absorption of CO2
c) Opening of stomata
d) Upward conduction of water
60. Indentify the selectively permeable membrane
a) Cell wall
b) Mitochondrial membrane
c) Plasmalemma
d) Chloroplast membrane
61. The plants imbibants are made up of :
a) Lignin like compounds
b) Cellulose and Pectin
c) Hydrophillic colloids
d) Hydrophobic colloids
62. Ascent of sap takes place through:
a) Phloem b) Cambium
c) Xylem vessels d) Epidermis
63. Rapid type of absorption is :
a) Salt absorption
b) Active absorption
c) Root absorption
d) Passive absorption
64. Root hairs develop in the zone of :
a) Growth b) Elongation
c) Maturation d) Either a or b
65. Water enters roots hairs due to :
a) Atmospheric pressure
b) Osmotic pressure
c) Turgor pressure d) Elastic pressure
66. Most active absorption of water takes place through :
a) Root cap b) Region of cell divison
c) Region of elongation
d) Region of Root hairs
67. When stem of a herbaceous plant is cut water oozes out due to :
a) Imbition b) Root pressure
c) Guttation d) Transpiration
68. Attraction force of cell walls for water molecules is termed as :
a) Cohesion b) Adhesion
c) Plasmolysis d) Osmosis
69. The active absorption of water does not require a direct supply of energy is known as:
a) Osmotic theory
b) Non osmotic theory
c) Electro osmotic active absorption
d) Passive water absorption
70. Ascent of sap means :
a) Diffusion of water
b) Loss of water from leaves
c) Building up of carbohydrates
d) The vertical rise of water in the stem against the force of gravity.
71. A leaf with hair on its surface......
a) Increase transpiration
b) Reduces guttation
c) Reduces transpiration
d) Reduces exchange of gases
72. Guard cells in majority of plants are:
a) Dumbbell shaped b) Rounded
c) Reniform d) Polygonal
73. The primary osmolite which causes an opening and closing of stomata is:
a) Starch b) sugar
c) Water d) K0-malate
74. Maximum transpiration occurs through:
a) Leaf b) Root c) Stem d) Fruits
75. In caryophyllaceous type of stomata, the number of subsidiary cells are :
a) 3 b) 2 c) 1 d) Many
76. The outer wall of stomata is :
a) Thick, convex, elastic
b) Thin, convex, elastic, permeable
c) Thin, concave, not elastic
d) Thick, concave, permeable
77. Boehm in 1809 proposed
a) Capillarity theory
b) Cohesion theory
c) Root pressure theory
d) Modern theory
78. In poorly aerated soil, deficient of O2, the rate of water absorption :
a) Remains same b) Increase
c) First increase then decrease
d) Decrease
79. In epiphytes moisture absorbed by:
a) Velamem b) Parenchyma
c) Mycorrhiza d) Root
80. Casparian strip is present in:
a) Epidermis b) Cortex
c) Root hair d) Endodermis
81. Cell wall of root hair is made up of :
a) Cellulose b) Cellulose and Pectin
c) Pectin d) Lipoprotein
82. Which one is not the function of Transpiration :
a) Ascent of sap b) Cooling effect
c) Excretion of minerals
d) Uptake of minerals
83. The ......... separates cell wall from protoplasm :
a) Plasmodesmata b) Plasmalemma
c) Tonoplast d) Tonoplasm
84. Guard cells differ from other epidermal cell in having :
a) Cell wall b) Vacuoles
c) Mitochondria d) Chloroplast
85. Selective permeability identifies the phenomenon of :
a) Osmosis b) Imbibition
c) Diffusion d) Plasmolysis
86. A cell shrinks when :
a) Outer solution is diluted
b) Outer solution is concentrated
c) Place in pure water
d) Both the solutions have the same concentration
87. Grapes placed in salt solution shrink due to :
a) Imbibition b) Plasmolysis
c) Endosmosis d) Exosmosis
88. The leaves take in air from the atmosphere through the :
a) Cells b) Cuticle
c) Chlorophyll d) Stomata
89. Cells completely lacking turgor pressure are called:
a) Dead cells b) Flaccid cells
c) Inactive d) Immobile
90. Water left in the soil after complete drainage of gravitational water is :
a) Field capacity b) Storage capacity
c) Soil water d) Gravitational capacity
91. Movement of molecules of gases, liquids and solutes from a region of higher concentration to a region of lower concentration is known as :
a) Osmosis b) Diffusion
c) Imbibition d) Evaporation
92. The pressure exerted by swollen vacuole on the cell wall is :
a) OP b)WP c) TP d)DPD
93. Dispersion of one substance in the medium of another substance is called:
a) Osmosis b) Diffusion
c) Imbibition d) Endosmosis
94. The water available to the plant from holard is called :
a) Echard b) Chresard
c) Gravitiational water
d) Hygroscopic water
95. Upward movement of water through xylem is best explained by :
a) Root pressure theory
b) Capillarity theory
c) Pulsation theory
d) Cohesion theory
96. Water supply in plants is due to :
a) Osmosis b) Guttation
c) Cohesive force d) Imbibition
97. To demonstrate ascent of sap, the ideal plant is :
a) Rose b) Coconut
c) Cucumber d) Balsam
98. 90% transpiration is :
a) Stomatal b) Cuticular
c) Lenticular d) Through roots
99. Low transpiration during storm is due to :
a) Low temperature during storms
b) High velocity of winds
c) Presence of moisture in wind
d) Both a and c
100.Transpiration is regulated by the movements of :
a) Mesophyll tissue of the leaf
b) Guard cells c) Subsidiary cells
d) Leaf epidermal cells
101. Structural modifications of xerophytes are to check :
a) Transpiration b) Photosynthesis
c) Respiration d) Absorption
102. The loss of water in the form of vapour from aerial plant parts is known as:
a) Osmosis b) Transpiration
c) Evaporation d) Respiration
103. Plants will undergo wilting under these conditions :
a) High temperature
b) Absorption of water
c) Heavy rainfall d) Light
104. Rate of transpiration is maximum when :
a) Soil is wet and air is dry
b) Soil is wet and air is humid
c) Soil is dry and air is humid
d) Both soil and air are dry
105. Wilting in the plant occurs due to process of :
a) Endosmosis b) Exosmosis
c) Diffusion d) Imbibition
106. In Lotus leaf stomata are present on:
a) Upper surface only
b) Lower surface only
c) More on lower less on upper surface d) Not present
107. Guttation occurs when :
a) Transpiration exceeds water absorption
b) Transpiration and water absorption are equal
c) Water absorption exceeds the rate of transpiration
d) Humidity is more
108. Identify the plant which absorbs water from atmosphere
a) Zizypus b) Melia
c) Orchid d) Moringa
109. Which is not related to transpiration?
a) Absorption and distribution of minerals
b) Circulation of water
c) Temperature d) Bleeding
110. The loss of water through cuticle may reach upto :
a) 5% b) 10% c) 20% d) 40%
111. The phytohormone which is supposed to be one of the factor responsible for regulating the opening and closing stomata is :
a) ABA b) GA c) IBA d) NAA
112. Plant cooling occurs due to:
a) Assimilation b) Photorespiration
c) Guttation d) Transpiration
113. High CO2 concentration in leaf interior will cause :
a) Sotmatal opening
b) Stomatal closure
c) No effect on stomata
d) Stomata are destroyed
114. Increase of .....decrease the rate of transpiration:
a) Lightb) CO2 conc. of atmosphere
c) Temperature
d) Water conc. in soil
115. Psychormeter is used to measure:
a) Wind speed b) Wind direction
c) Temperature d) Relative humidity
116. In vacuolar pathway, water may cross at least ...... plasma membranes from each cell :
a) One b) Two
c) Three d) More than two
117. Source of turgor in plant cell is :
a) Air b) Water
c) Hormones d) Root
118. A cell becomes flaccid when placed in a .... solution :
a) Hypotonic b) Hypertonic
c) Isotonic d) Normal
119. Manometer measures :
a) Root pressure b) Size of stomata
c) Atmospheric pressure
d) Soil water tension
120. For plants transpiration is :
a) Not very important
b) An unimportant burden
c) A necessary evil
d) Important to some
121. Root pressure is developed when :
a) Transpiration is high and water absorption is high
b) Transpiration is low and water absorption is low
c) Transpiration is low and water absorption is high
d) Transpiration is high and water absorption is low
122. During excessive transpiration diameter of xylem is ......
a) Decreased b) Increased
c) Has no effect d) Remains same
123. In leaves ........ is absent :
a) Chlorophyll b) Stomata
c) Cuticle d) Lenticel
124. In comparison to epidermal cells, the size of the guard cells are :
a) Large b) Medium
c) Much smaller d) Same
125. DPD is equivalent to :
a) O.P. b) T.P.
c) W.P. d) Water potential
126. Who demonstrated absorption of water by root hairs ?
a) Steward b) Levitt
c) Rosene d) Sachs
127. Passage cells are in :
a) Epidermis b) Xylem
c) Cortex d) Endodermis
128. Highest rate of diffusion is shown by:
a) Solids b) Gases
c) Liquids d) Solids and Liquids
129. During the process of photosynthesis and respiration gaseous exchange takes place with the help of :
a) Diffusion b) Imbibition
c) Plamolysis d) Osmosis
130. In active absorption the forces responsible for absorption of water develops in the :
a) Shoot b) Leaves
c) Roots d) Both a and b
131. The number of stomata on the leaf surface are in :
a) Tens b) Hundreds
c) Thousands d) Millions
132. Stomata open a day time because of presence of :
a) Sugar b) Carbohydrate
c) Sucrose d) Potassium
133. Root hair is found above the :
a) Elongation region
b) Conduction region
c) Absorbing region d) Root cap
134. Root pressure is developed due to:
a) Low absorption of water
b) High absorption of water and low transpiration c) High transpiration
d) Low absorption of water and low transpiration
135. In guard cells, outer wall is :
a) thin, elastic
b) thick and elastic
c) thin and not elastic
d) thick and non-elastic
136. Semipermeability is the property of
a) Plasma membrane
b) Cell wall c) Golgibody
d) Endoplasmic Reticulum
137. Plant cooling occurs due to :
a) Guttation b) Photorespiration
c) Transpiration d) Absorption
138. During day time when stomata are open the pH of guard cell will be:
a) 7 b) Less than 7
c) More than 7 d) Highly alkaline
139. The loss of water through cuticle may be as high as :
a) 10% b) 20% c) 5% d) 40%
140. The force developed in cortex of root which pushes water into xylem of root is:
a) Root pressure b) Turgor pressure
c) Diffusion d) Osmotic pressure
141. In the process of osmosis, the volume of solvent :
a) Remains the same b) Increases
c) Decreases d) Either b or c
142. From the leaf mesophyll cells water is transpired, which develop lower water potential than the:
a) leaf xylem sap b) Root xylem sap
c) Root phloem sap
d) Stem xylem sap
143. The shade of a tree is cooler than the shade of a roof, due to :
a) Guttation b) Green leaves
c) Transpiration d) Photosynthesis
144. Water lost by transpiration is :
a) Pure water
b) Rich in dissolved minerals
c) Rich in dissolved salts
d) Rich in solutes
145. According to Steward, ATP is used in stomatal mechanism during :
a) Closing b) Opening
c) Both the process
d) Maintaining the size
146. Stomata closes by :
a) IAA b) GA c) ABA d) CK
147. In woody plants or old trees transpiration also occurs through :
a) Stomata b) Lenticels
c) Bark d) Roots
148. The floral twig in water, with added pinch of salt it will :
a) Undergoes plasmolysis
b) Be conserved for longer period
c) Remain fresh because DPD of plant twig increases due to addition of salt d) Water evaporation
149. Presence of water drops on the margins of leaes in early morning is due to :
a) Condensation of dew
b) Transpiration
c) Exudation from injured parts of leaf d) Guttation
150. Total water content in the soil is:
a) Chesard b) Holard
c) Echard d) Absorption
151. The first cell which absorbs water is
a) Epidermis b) Holard
c) Stomata d) Root hair
152. ..... acts as an osmometer :
a) Osmosis b) Root hair
c) Potometer d) Xylem
153. Osmosis takes place only in :
a) Liquids b) Solids
c) Gases d) Solids and gases
154. A turgid cell contains high amount of:
a) Minerals b) Metals
c) Ions d) Water
155. Osmotic potential of a solution is always :
a) Positive b) Negative
c) Zero d) Variable
156. Flooding kills plants because :
a) Cell sap in plants become too dilute
b) Root respiration ceases
c) Soil nutrients in plants become too dilute
d) Excess water leaches down plant nutrients
WATCH PLAYLIST FOR UNDERSTANDING AND ANSWERING
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