Plant Water Relation Objective Type Questions and Answers

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

Answer: Cohesion theory

28 Transpiration rate is dependent upon

A State of stomata

B Stomatal frequency

C Position of stomata

D All the above

View Answer

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

View Answer

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

View Answer

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

View Answer

Answer: Endoosmosis

32 Water absorption takes place through

A Root hairs

B Tap root

C Lateral roots

D None of above

View Answer

Answer: Root hairs

33 Which of the following is an anti-transpirant

A PAN

B AUG

C IAA

D PMA

View Answer

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

View Answer

Answer: Potometer

35 Stomata open at night and close during day time in

A Succulents

B Hydrophytes

C Xerophytes

D Mesophytes

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

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

View Answer

Answer: Hypotonic solution

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