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Free download in PDF Plant Water Relation Multiple Choice 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.
(1)
What is the measure of the osmotic pressure gradient of solutions separated by a semipermeable membrane?
[A]
Tonicity
[B]
Ficks law
[C]
Water potential
[D]
Turgor pressure
(2)
Name the condition in which protoplast of the plant cell shrinks away.
[A]
Plasmolysis
[B]
Rigid
[C]
Turgid
[D]
Flaccid
(3)
Which of the following is NOT the component of water potential?
[A]
Assimilation potential
[B]
Pressure potential
[C]
Osmotic potential
[D]
Gravitational potential
Answer: Assimilation potential
(4)
Loss of water from the stomata of leaves are known as
[A]
Transpiration
[B]
Guttation
[C]
Exudation
[D]
None of these
(5)
Plasmolysis occurs due to
[A]
Exosmosis
[B]
Absorption
[C]
Osmosis
[D]
Endoosmosis
(6)
Cooling of plants is caused by
[A]
Transpiration
[B]
Photorespiration
[C]
Guttaion
[D]
None of these
(7)
Active uptake of minerals by roots mainly depends on the
[A]
Availability of CO2
[B]
Temperature
[C]
Availability of oxygen
[D]
None of these
Answer: Availability of oxygen
(8)
The hormone which signals the closure of stomata is
[A]
Abscisic acid
[B]
Gibberelline
[C]
Auxins
[D]
Cytokinine
(9)
What is the action spectrum of transpiration?
[A]
Blue and red
[B]
Green and ultraviolet
[C]
Orange and red
[D]
None of these
(10)
Which is produced during water stress that brings stomatal closure?
[A]
Abscisic acid
[B]
Coumarin
[C]
Ethylene
[D]
None of these
(11)
Chlorophyllous cells fewer in number, unique in shape with inner walls thicker are
[A]
Bulliform Cells
[B]
Passage Cells
[C]
Guard Cells
[D]
Subsidiary Cells
(12)
Water in plants is transported by which of the followings?
[A]
Xylem
[B]
Epidermis
[C]
Cambium
[D]
None of above
(13)
The most widely accepted theory of water translocation in plants is ______.
[A]
Root pressure theory
[B]
Cohesion theory
[C]
Water pump theory
[D]
Capillary theory
(14)
Transpiration is helpful to plants in
[A]
Upward Conduction/Ascent Of Sap
[B]
Cooling
[C]
Loss Of Excess Nutrients
[D]
Loss Of Excess Water
Answer: Upward Conduction/Ascent Of Sap
(15)
The water available for plants in soil is ________.
[A]
Capillary Water
[B]
Gravitational Water
[C]
Chemically Bound Water
[D]
Hygroscopic Water
(16)
The maximum loss of water in transpiration is from
[A]
Stomata
[B]
Cuticle
[C]
Lenticels
[D]
Hydothodes
(17)
Water lost through transpiration is
[A]
Rich In Dissolved Salts
[B]
Rich In Organic Solutes
[C]
Pure Water
[D]
All The Above
(18)
The conditions under which transpiration would be most rapid?
[A]
Low humidity, high temperature, guard cell are turgid (open) moist soil
[B]
High humidity
[C]
Low velocity of wind
[D]
Excess of water in soil
Answer: Low humidity, high temperature, guard cell are turgid (open) moist soil
(19)
Which of the following will be zero in a fully turgid cell?
[A]
Suction pressure (DPD)
[B]
Imbibitional pressure
[C]
Wall pressure
[D]
Turgor pressure
Answer: Suction pressure (DPD)
(20)
Endosmosis occurs when the plant cell is placed in
[A]
Hypotonic solution
[B]
Isotonic solution
[C]
Hypertonic solution
[D]
Strong solution
Answer: Hypotonic solution
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