Plant Water Relation MCQs | Plant Water Relation Short Questions and Answers

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Questions
41 The rapid type of water absorption is
A Passive absorption
B Active non-osmotic absorption
C Active absorption
D Active osmotic absorption

Answer: Passive absorption
42 Root pressure is due to
A Increased transpiration
B Passive absorption
C Increased turgidity
D Active absorption

Answer: Active absorption
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43 Root pressure is absent in
A Gymnosperms
B Trees
C Herbaceous plants
D Dicot plant

Answer: Gymnosperms
44 Maximum root pressure is observed when
A Transpiration is high and absorption is low
B Transpiration is low an dabsorption is high
C Transpiration and absorption are very high
D Transpiration and absorption are very low

Answer: Transpiration is low an dabsorption is high
45 The existence of root pressure can be demonstrated by
A Bleeding
B Wilting
C Transpiration
D Exudation or bleeding

Answer: Exudation or bleeding
46 Which of the following physical forces are supposed to be responsible for ascent as sap?
A Transpiration pull and cohesion
B Capillary force
C Imbibition
D Root pressure

Answer: Transpiration pull and cohesion
47 Upward movement of water in plants is
A Sucking
B Transpiration
C Exudation
D Ascent of sap

Answer: Ascent of sap
48 In a plant cell, O.P. is equal to
A T.P. – D.P.
B D.P.D. + T.P.
C T.P. – D.P.D
D D.P.D. – T.P.

Answer: D.P.D. – T.P.
49 Absorption of water from cut ends of stems disapproves the theory of
A Root pressure theory
B Imbibitional pressure theory
C Capillarity
D Cohesion-tension theory

Answer: Root pressure theory
50 Stomata opens because the guard cells have-
A Inner thick walls
B Kidney shape
C Outer thin walls
D Chloroplast

Answer: Kidney shape
51 The special modified epidermal cells surrounding stomatal pore are called
A Subsiduary cells
B Accessory cells
C Guard cells
D Epithelial cells

Answer: Guard cells
52 The cells which are closely associated and intercating with guard cells are
A Subsidiary cells
B Hypodermal cells
C Transfussion tissue
D None of above

Answer: Subsidiary cells
53 Transpiration through leaves in called as
A Foliar transpiration
B Lenticular transpiration
C Cauline transpiration
D Cuticular transpiration

Answer: Foliar transpiration
54 Maximum root pressure develops, when
A Transpiration is low and absorption is high
B Transpiration and absorption are high
C When transpiration and absorption are low
D Transpiration is low and absorption is low

Answer: Transpiration is low and absorption is high
55 DPD of flacid cell and turgid cell is ______and _____ respectively.
A Zero and Maximum
B Minimum and Maximum
C Zero and zero
D Maximum and Minimum

Answer: Maximum and Minimum
56 The magnitude of root pressure will be minimum in
A During ascent of sap
B Fast transpiring angiosperms
C Wilting plant
D Rainy season

Answer: Rainy season
57 Cohesion of water molecules is due to___________
A Surface tension
B Gravitational force
C Diffusion
D Osmosis

Answer: Surface tension
58 Which of the following is NOT the property of water?
A Nonpolar molecule
B High specific heat
C High heat of vaporization
D Excellent solvent

Answer: Nonpolar molecule
59 Name the term which is given for the movement of water through a semipermeable membrane?
A Osmosis
B Tonicity
C Diffusion
D Transpiration

Answer: Osmosis
40 A cell increase in volume when it is placed in
A Hypotonic solution
B Isotonic solution
C Hypertonic solution
D None of these

Answer: Hypotonic solution
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