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Free download in PDF Plant Water Relation Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(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
(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
(23)
Which of the folowing is due to hydrostatic pressure
[A]
Exeudation
[B]
Transpiration
[C]
Osmosis
[D]
Plasmolysis
(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
(28)
Transpiration rate is dependent upon
[A]
State of stomata
[B]
Stomatal frequency
[C]
Position of stomata
[D]
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
32
Water absorption takes place through
[A]
Root hairs
[B]
Tap root
[C]
Lateral roots
[D]
None of above
33
Which of the following is an anti-transpirant
[A]
PAN
[B]
AUG
[C]
IAA
[D]
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
35
Stomata open at night and close during day time in
[A]
Succulents
[B]
Hydrophytes
[C]
Xerophytes
[D]
Mesophytes
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
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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