Plant Water Relation MCQs | Plant Water Relation Multiple Choice Questions and Answers

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

Answer: Tonicity
2 Name the condition in which protoplast of the plant cell shrinks away.
A Plasmolysis
B Rigid
C Turgid
D Flaccid

Answer: Plasmolysis
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

Answer: Transpiration
5 Plasmolysis occurs due to
A Exosmosis
B Absorption
C Osmosis
D Endoosmosis

Answer: Exosmosis
6 Cooling of plants is caused by
A Transpiration
B Photorespiration
C Guttaion
D None of these

Answer: Transpiration
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

Answer: Abscisic acid
9 What is the action spectrum of transpiration?
A Blue and red
B Green and ultraviolet
C Orange and red
D None of these

Answer: Blue and red
10 Which is produced during water stress that brings stomatal closure?
A Abscisic acid
B Coumarin
C Ethylene
D None of these

Answer: Abscisic acid
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

Answer: Guard Cells
12 Water in plants is transported by which of the followings?
A Xylem
B Epidermis
C Cambium
D None of above

Answer: Xylem
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

Answer: Cohesion 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

Answer: Capillary Water
16 The maximum loss of water in transpiration is from
A Stomata
B Cuticle
C Lenticels
D Hydothodes

Answer: Stomata
17 Water lost through transpiration is
A Rich In Dissolved Salts
B Rich In Organic Solutes
C Pure Water
D All The Above

Answer: Pure Water
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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