CBSE Questions for Class 11 Medical Biology Transport In Plants Quiz 14 - MCQExams.com

In active non-osmotic absorption of water the OP of the cell sap of root hairs is .............. than / to OP of the soil water.
  • Higher
  • Lower
  • Both A and B
  • Equal
The phenomenon of osmosis was first introduced by
  • Sachs
  • Pfeffer
  • Nollet
  • Strasburger
Which one of the following, measures osmotic potential of a solution by measuring its freezing point?
  • Potato osmometer
  • Cryoscopic osmometer
  • Potometer
  • All of the above
Which of the following processes cause substances to move across membranes without the expenditure of cellular energy?
  • Endocytosis
  • Exocytosis
  • Active transport
  • Diffusion
If an animal cell is placed into a solution whose concentration of dissolved substances is higher than that inside the cell, then
  • The cell will swell.
  • The cell will shrivel.
  • The solution is described as hypertonic.
  • Both B and C.
In plants, atmospheric pressure can rise water to the maximum of
  • 40 ft
  • 38 ft
  • 34 ft
  • 30 ft
Match the theories given with the names of scientists. Choose the answer which gives the correct combination of the alphabets.
Names of theories
Names of scientists
A. Relay pump theory
p. Schleiden
B. Cohesion tension theory     
q. Sir J.C. Bose
C. Mass flow theory
r. Godlewski
D. Pulsation theory
s. Dixon and Jolly

t. Ernst Munch
  • A- q, B- p, C- t, D- r
  • A- r, B- q, C- t, D- q
  • A- s, B- r, C- p, D- q
  • A- r, B- s, C- t, D- q
The turgidity of the guard cells is maintained by
  • OP
  • TP
  • WP
  • DP
Presence of bicollateral vascular bundle provides evidence that conduction of food takes place through the
  • Phloem
  • Xylem
  • Both A and B
  • None of the above
Water potential in the leaf tissue is positive (+ve) during
  • Excessive transpiration
  • Low absorption
  • Low transpiration
  • Guttation
Chemicals like KCN and sodium azide ________.
  • Inhibitis water absorption
  • Enhances respiration
  • Enhances photosynthesis
  • All of the above
Phloem loading is
  • Translocation of starch in high concentration in sieve tubes
  • Translocation of raffinose along with only solvents through sieve tubes by apoplastic operation
  • Presence of solutes in sieve tubes without any turgor pressure
  • Symplastic operation transporting raffinose or stachyose in addition to sucrose
Which one of the following statement is wrong?
  • Water potential is the chemical potential of the water.
  • Solute potential is always negative.
  • Pressure potential is zero in a flaccid cell.
  • Water potential equals solute potential in a fully turgid cell.
  • Pressure potential is negative in a plasmolyzed cell.
Match the names of activities listed with the description of activity given under the columns. Choose the answer which gives the correct combination of the alphabets of the two columns.
Activities
Description of activity
A. Transpiration
p. Anaerobic respiration in yeast
B. Guttation
q. Active absorption of water
C. Exudation
r. Loss of water vapour from plant parts
D. Fermentation
s. Loss of liquid water from leaves

t. Loss of water from injured plant parts
  • A- s, B- r, C- p, D- r
  • A- r, B- s, C- t, D- p
  • A- p, B- t, C- s, D- r
  • A- q, B- r, C- s, D- t
In a flaccid cell, which condition does not occur?
  • TP = 1
  • SP = 0 
  • SP=OP
  • None of the above
If osmotic potential of a cell is -10 bars and its pressure potential is 5 bars, its water potential would be
  • - 5 bars
  • 5 bars
  • - 10 bars
  • 10 bars
In 0.1 M solution of a non electrolyte, $$\Psi w$$ value will be
  • Zero bar
  • + 2.3 bar
  • - 24.7 bar
  • - 22.4 bar
Terms apoplast and symplast were first used by
  • Clark
  • Munch
  • Dixon
  • Lundegardh
Match the columns.
Cytochrome pump theory
A. Mitchell
Streaming of protoplasm
B. Lundegardh
Chemiosmotic hypothesis
C. Munch
Symplast and apoplast
D. de Vries
  • 1- B, 2- D, 3- A, 4- C
  • 1- A, 2- B, 3- C, 4- D
  • 1- B, 2- D, 3- C, 4- A
  • 1- C, 2- B, 3- A, 4- D
In plant relations, $$\Psi$$ indicates 
  • DPD
  • Solute potential
  • Water potential
  • Suction pressure
If in a cell suction pressure value is 30 atm, while osmotic pressure 42 atm, then calculate the turgidity developed in form of TP in the cell.
  • 45 atm
  • 72 atm
  • 12 atm
  • 1.4 atm
Casparian strips are ....................... in nature.
  • Impermeable
  • Semipermeable
  • Differentialy permeable
  • All of the above
If the molar concentration of the given sugar solution is 0.3 M, find out the osmotic pressure of this solution.
  • 7.33 atm
  • 6.72 atm
  • 2.24 atm
  • 5.60 atm
In which part of the plant, the rate of respiration is higher?
  • Root and stem tip
  • Buds
  • Germinating seeds
  • All of the above
Water enters into the root hair from the soil by
  • Diffusion
  • Active transport
  • Reverse osmosis
  • Osmosis
Aquatic plants loose most of their metabolic wastes by .......... process.
  • Diffusion
  • Osmosis
  • Reverse osmosis
  • Dialysis
If the OP of any osmotic system is 35 atm and its turgor pressure 9 units. Find out water potential present in the osmotic system.
  • - 44 unit
  • - 26 unit
  • 26 unit
  • - 3.88 unit
Take four peeled potato halves and scoop each one out to make potato cups. One of these potato cups should be made from a boiled potato. Put each potato cup in a trough containing water.

(a) Keep cup A as empty.
(b) Put one teaspoon sugar in cup B.
(c) Put one teaspoon salt in cup C.
(d) Put one teaspoon sugar in the boiled potato cup D.
Keep these for two hours. Then observe the four potato cups and answer the following.

Explain why water gathers in the hollowed portion of B and C.
  • There is the difference in the concentration of water in the through and water in the cup (Potato).
  • Exosmosis takes place as the potato cells act as a semipermeable membrane.
  • Both A and B.
  • None of these
The right sequence for imbibition is
  • Protein > cellulose > agar agar
  • Agar agar > cellulose > protein
  • Agar agar > protein > cellulose
  • Cellulose > agar agar > protein
Transpiration is a non-enzymatic process. Its $$Q_{10}$$ value is
  • 1
  • 2
  • 3.5
  • 0
Take four peeled potato halves and scoop each one out to make potato cups. One of these potato cups should be made from a boiled potato. Put each potato cup in a trough containing water.

(a) Keep cup A as empty.
(b) Put one teaspoon sugar in cup B.
(c) Put one teaspoon salt in cup C.
(d) Put one teaspoon sugar in the boiled potato cup D.
Keep these for two hours. Then observe the four potato cups and answer the following.

Why is potato A necessary for this experiment?
  • It acts as a control.
  • It acts as a accessory.
  • Both A and B
  • None of these
The most powerful imbibant is
  • Agar agar
  • Proteins
  • Cellulose
  • Lignin
" Non - osmotic" theory for an active absorption of water was given by
  • Thimann and Kramer
  • Atkin and Priestley
  • J. C. Bose
  • O. Hertig
What is meant by deplasmolysis?
  • Process of returning of plasmolysed cell to its initial stage.
  • Process of returning of plasmolysed cell to more plasmolysed stage.
  • Process of returning of normal cell to its plasmolysed stage.
  • Process of returning of normal cell to its shrink form.
Osmosis is defined as the movement of solvent particles through__________
  • Permeable membrane
  • Semi-permeable membrane
  • Membrane
  • None of these
Animal cells do not show plasmolysis because
  • They do not exhibit osmosis.
  • They do not possess cell wall.
  • They are living cells.
  • They have intercellular spaces.
Osmosis can be defined as
  • The diffusion of water or solvent through a semipermeable membrane from a solution of a lower concentration of solutes to a solution of a higher concentration of solutes, to which the membrane is relatively impermeable, is called osmosis.
  • The diffusion of water or solvent through an impermeable membrane from a solution of a lower concentration of solutes to a solution of a higher concentration of solutes, to which the membrane is relatively impermeable, is called osmosis.
  • The diffusion of water or solvent through a semipermeable membrane from a solution of a higher concentration of solutes to a solution of a lower concentration of solutes, to which the membrane is relatively impermeable, is called osmosis.
  • None of the above.
Correct statement is 
  • Roots of plant respire through lenticels and stomata.
  • Stem of plant respire through lenticels.
  • Stem and roots respire through lenticels.
  • Stem and roots respire through stomata. 
Take four peeled potato halves and scoop each one out to make potato cups. One of these potato cups should be made from a boiled potato. Put each potato cup in a trough containing water.

(a) Keep cup A as empty.
(b) Put one teaspoon sugar in cup B.
(c) Put one teaspoon salt in cup C.
(d) Put one teaspoon sugar in the boiled potato cup D.
Keep these for two hours. Then observe the four potato cups and answer the following.

Explain why water does not gather in the hollowed out portions of A and D.
  • In A no concentration gradient occurs, in D no semipermeable membrane present
  • In A no semipermeable membrane, in D no concentration gradient
  • Both A and B
  • None of these
Plasmolysis is not observed in boiled plant tissue because 
  • The cell wall becomes impermeable to water
  • The cell membrane disintegrates
  • The cell wall disintegrates
  • The cell membrane becomes impermeable to water
Normally, in the process of osmosis, the net flow of water molecules in or out of the cell depends upon differences in the
  • Concentration of water molecules inside and outside the cell
  • Concentration of enzymes on either side of the cell membrane
  • Rate of molecular motion on either side of the cell membrane
  • Rate of movement of insoluble molecules inside the cell
Plasmolysis in a plant cell is defined as
  • Breakdown (lysis) of plasma membrane in hypotonic medium
  • Shrinkge of protoplasm in hypertonic medium
  • Shrinkage of nucleoplasm
  • None of the above
Find out the incorrect statement.
  • Osmosis is a slow process, occurs down the concentration gradient and does not expend energy.
  • Electron microscope uses very high voltage electricity. It uses electromagnets instead of glass lenses and a beam of electrons instead of light.
  • The semipermeable membrane does not allow both solvent and solute molecules to pass through it.
  • Active transport of materials is rapid and usually, occurs against the concentration gradient involving carrier proteins and energy in the form of ATP.
Osmosis takes place between two solutions separated by a semipermeable membrane because
  • Water molecules move from more dilute solution to less dilute solution
  • Solute molecules move from less dilute solution to more dilute solution
  • Water molecules move from less dilute solution to more dilute solution
  • Solute molecules move from more dilute solution to less dilute solution
Osmosis is the movement of ________________
  • Solute particles from higher concentration to lower concentration
  • Solvent particles from lower solute concentration to the higher solute concentration of solution through a semipermeable membrane
  • Solute particles from higher concentration to lower concentration through a semipermeable membrane
  • Solvent particles from lower water potential to higher water potential
The given figure represents a plant cell after being placed in a strong sugar solution. The different parts have been labelled as a, b, c, d and e. Which of the following is the correct labelling?
315004_31795f4006cd49e28fd2d8d701141830.png
  • a- Cell wall, b- Sugar solution, c- Protoplasm, d- Vacuole, e- Cell membrane
  • a- Cell membrane, b- Sugar solution, c- Protoplasm, d- Vacuole, e- Cell membrane
  • a- Cell wall, b- Sugar solution, c- Vacuole, d- Protoplasm, e- Tonoplast
  • a- Cell membrane, b- Sugar solution, c- Vacuole, d- Protoplasm, e- Tonoplast
Freshly cut potato chip is put into a strong solution of sugar, later it will be found
  • Flaccid
  • Turgid
  • More full of starch
  • More full of sugar
The initial stage of water absorption by root cells is by
  • Absorption
  • Imbibition
  • Osmosis
  • Respiration
Epithem is associated with
  • Respiration
  • Guttation
  • Transpiration
  • Photosynthesis
Latika observed her grandmother adding lots of salt on unripe mangoes to prepare pickles. Her grandmother also added an excess of oil in the pickle jar. What could be the reason for it?
  • Salt prevents the growth of microorganisms by retaining moisture in the food item and oil provides an environment in which microorganisms cannot grow.
  • Salt prevents the growth of microorganisms by forcing them to lose water by osmosis and oil provides an environment in which microorganisms cannot grow.
  • Salt prevents the growth of microorganisms by retaining moisture in the food item and oil prevents their growth by forcing out water from them by osmosis.
  • Salt prevents the growth of microorganisms by forcing them to lose water by osmosis and oil prevents their growth by retaining moisture in the food item.
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