Plant Water Relation Quiz | Plant Water Relation Objective Type Questions and Answers

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Questions
21 Pressure developed on cell wall of plant cell caused by osmotic movement of water is called as
A DPD
B Suction pressure
C Osmotic pressure
D Turgor pressure

Answer: Turgor pressure
22 The hydrostatic pressure which is developed due to accumulation of water absorbed by roots is called
A Root pressure
B Diffusion pressure
C Turgor pressure
D Wall pressure

Answer: Root pressure
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23 Which of the folowing is due to hydrostatic pressure
A Exeudation
B Transpiration
C Osmosis
D Plasmolysis

Answer: Exeudation
24 Which of the following theory cannot explain the ascent of sap in tall trees.
A Root pressure and capillarity
B Capillarity and physical force theory
C Root pressure and Transpiration pull
D None of these

Answer: Root pressure and capillarity
25 Which one gives the most valid explanation for guard cell movements?
A Potassium influx and efflux
B Transpiration
C Guard cell photosynthesis
D Starch hydrolysis theory

Answer: Potassium influx and efflux
26 Transpiration differs from evaporation in
A transpiration is a physiological process while evaporation is a physical process
B frequency of water loss
C transpiration is a physical process while evaporation is a physiological process
D None of these

Answer: transpiration is a physiological process while evaporation is a physical process
27 Which of the following explain ascent of sap?
A Guttation
B Mass flow
C Diffusion
D Cohesion theory

Answer: Cohesion theory
28 Transpiration rate is dependent upon
A State of stomata
B Stomatal frequency
C Position of stomata
D All the above

Answer: All the above
29 Root hairs absorb water from soil when
A solute concentration is higher in soil solution
B absorption is active
C osmotic concentration is same in the two
D solute concentration is higher in root hairs

Answer: solute concentration is higher in root hairs
30 Transpiration is least in
A High atmospheric humidity
B High wind velocity
C Good soil moisture
D Dry environment

Answer: High atmospheric humidity
31 The marine animals that kept in fresh water burst. It shows the process of
A Endoosmosis
B Deplasmolysis
C Exosmosis
D Plasmolysis

Answer: Endoosmosis
32 Water absorption takes place through
A Root hairs
B Tap root
C Lateral roots
D None of above

Answer: Root hairs
33 Which of the following is an anti-transpirant
A PAN
B AUG
C IAA
D PMA

Answer: PMA
34 Which one of the following is used for measuring the rate of transpiration?
A Potometer
B Osmometer
C Porometer
D Moll’s experiment

Answer: Potometer
35 Stomata open at night and close during day time in
A Succulents
B Hydrophytes
C Xerophytes
D Mesophytes

Answer: Succulents
36 The part of Root involved in water absorption is
A Zone of root hairs
B Zone of root cap
C Zone of cell division
D Zone of elongation

Answer: Zone of root hairs
37 Diffusion of water through semipermeable membrane from dilute solution to concentrated solution is
A Osmosis
B Necrosis
C Imbibition
D Plasmolysis

Answer: Osmosis
38 The membrane which allows the movement of only water molecules to pass through it and not the solute particles
A Semipermeable membrane
B Imperimeable membrane
C Permeable membrane
D Not permeable

Answer: Semipermeable membrane
39 Cell wall of root hair has two layers outer and inner which are made up of
A Pectin and cellulose respectively
B Lignin and cellulose respectively
C Pectin and lignin respectively
D Cellulose and pectin respectively

Answer: Pectin and cellulose respectively
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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