CBSE Questions for Class 11 Medical Biology Transport In Plants Quiz 10 - MCQExams.com

Bacteria cannot survive in a pickle with high salt concentration because
  • Salt inhibits reproduction of bacteria.
  • They will be killed due to plasmolysis.
  • Nutrients in it cannot support life.
  • Enough light is not available for photosynthesis.
Water potential increases due to
  • Evaporation
  • Addition of solutes
  • Pressure
  • Afforestation
Which of these is not directly connected with ascent of sap?
  • Cohesion theory
  • Root pressure
  • Apoplast and symplast
  • Capillarity
Water absorption by root hair occurs until 
  • Concentration of water in the cell sap is higher
  • Salt concentration in cell sap is higher
  • They are separated from the soil by a selectively permeable membrane
  • Water potential is lower
Most water flow in root occurs via apoplast as
  • Cortical cells are living cells
  • Cortical cells are loosely arranged
  • Cortical cells are thin walled
  • All the above
Which pathway involves cell wall and intercellular spaces both?
  • Vascular pathway
  • Protoplast pathway
  • Symplast pathway
  • Apoplast pathway
Grahm's law is concerned with
  • Diffusion
  • Osmosis
  • Osmoregulation
  • Absorption
Match and find the correct combination :

  LIST I  LIST II
 A. Scotoactive stomata 1. Opening and closing of photo active stomata
 B. Guttation 2. Transpiration
 C. Tensile strength 3. Water loss in liquid phase
 D. K$$^+$$ pump theory 4. Night transpiration
   5. Antitranspirant
  • A - 4, B - 3, C - 2, D - 1
  • A - 3, B - 4, C - 1, D - 2
  • A - 4, B - 2, C - 1, D - 3
  • A - 1, B - 2, C - 4, D - 3
Guttation occurs only in
  • Hydrophytes
  • Mesophytes
  • Mangroves
  • Marshy plants
Pressure potential in a plasmolysed cell is
  • Positive
  • Zero
  • Negative
  • Remains same
Select the matched ones.
(i) Guttation - Water loss in liquid phase.
(ii) Adhesion - Mutual attraction between water molecules.
(iii) Imbibition - Absorption of water by dry wood.
(iv) Hypotonic solution - Cells shrink.
  • i, ii and iii only
  • ii and iv only
  • iii and iv only
  • i and iii only
Find out the correct pair of statements :
(i)  In completely plasmolysed cell, pressure potential does not contribute to water potential.
(ii)  If a cell is placed in hypotonic solution for longer time, the cell membrane shrinks away from its cell wall.
(iii) Apoplastic system comprises inter-connected protoplasts.
(iv) Polypeptides have more imbibing capacity than polysaccharides.
  • i, iv
  • i, ii
  • ii, iv
  • iii, iv
Osmometer having 0.5 M solution can made to shrink when immersed in ............... solution
  • 0.05 M
  • 0.75 M
  • 0.5 M
  • Distilled water
Which of the following is not significant in osmosis?
  • Gravitational potential
  • Concentration gradient
  • Solute potential
  • Pressure potential
Which does not pertain to facilitated transport?
  • Uphill transport
  • High selectively
  • Transport saturation
  • Requirement of special membrane proteins
What happens when concentration of solutes decreases in guard cells?
  • Water potential increases
  • Osmotic pressure increases
  • Water potential decreases
  • None of the above
Water potential of pure water at standard temperature is equal to
  • 10
  • 20
  • 0
  • None of the above
Process of water exudation from hydathodes is known as
  • Guttation
  • Transpiration
  • Evaporation
  • Bleeding
Apoplastic movement of water occurs exclusively through the 
(i) Intercellular spaces
(ii) Walls of the cells
(iii) Plasmodesmata
(iv) Cytoplasm
  • i, ii and iv
  • iii and iv
  • i and ii
  • ii and iv
  • iv
Imbibition involves
  • Solute potential
  • Gravity potential
  • Matric potential
  • Pressure potential
In the given diagram, which is the initial condition of plasmolysis :
668852_68485a4d20d845e3879f65ebf6e89931.png
  • P
  • Q
  • R
  • S
Water lost through the process of guttation is in
  • Liquid form containing dissolved minerals
  • Liquid form without dissolved minerals
  • Vapour form with minerals
  • Vapour form without minerals
Which of the following is not correct with respect to mass flow hypothesis?
  • Loading of phloem sets up a water potential gradient that facilitates the mass movement in phloem.
  • The sugar which is transported in phloem sieve.
  • The sugar is moved bidirectionally
  • As hydrostatic pressure in phloem sieve tube increases, pressure flow stops and sap accumulates in phloem.
Water potential gradient between the absorbent and the liquid imbibed is essential for imbibition. In addition, for any substance to imbibe any liquid, one of the following is also a pre-requisite
  • Affinity between adsorbent and the liquid.
  • Molecular density of adsorbent.
  • Concentration of adsorbent
  • Pressure potential of the absorbant
Incipent plasmolysis is
  • Last stage of plasmolysis
  • Mid stage of plasmolysis
  • Zero hour for inception of plasmolysis
  • Initial stage of plasmolysis
Plasmolysis occurs when water moves into the cell.
  • True
  • False
The apoplast is located
  • Outside the plasma membrane
  • In the entire cytosol
  • On both sides of plasma mebrane
  • In the plastidial content
Whose water potential is less than water potential of root hair during the water absorption by root hair?
  • Gravitational water
  • Soil solution
  • Pure water
  • Vacuolar sap
During rainy season wooden doors and windows are not properly closed, why?
  • Imbibition
  • Diffusion
  • Osmosis
  • Plasmolysis
Which of the following does not affect water potential of water?
  • Concentration of dissolved substances
  • Atmospheric pressure
  • Gravitation
  • Capillarity
The process by which the soaked seeds absorbs water is known as
  • Imbibition
  • Diffusion
  • Osmosis
  • All of the above
Root pressure is measured by
  • Potometer
  • Barometer
  • Manometer
  • Auxanometer
 Passive water absorption by root system is due to 
  • Force created in roots
  • Osmotic force In shoot
  • High respiratory activity of root
  • Tension in sap due to transpiration.
Match List I(Element) with List II(Process) and select the correct answer.
List IList II
a. Molybdenum$$1$$. Photosynthesis
b. Manganese$$2$$. Respiration
c. sulphur$$3$$. Nitrate reduction
d. Calcium$$4$$. Cell division
$$5$$. Protein synthesis
  • A-$$5$$, B-$$2$$, C-$$3$$, D-$$1$$
  • A-$$3$$, B-$$1$$, C-$$5$$, D-$$4$$
  • A-$$2$$, B-$$1$$, C-$$4$$, D-$$5$$
  • A-$$3$$, B-$$2$$, C-$$4$$, D-$$5$$
Root pressure is high when __________________.
  • Transpiration is high and absorption of water is low.
  • Transpiration is low and absorption of water is high.
  • Transpiration is low and absorption of water is low.
  • Transpiration is high and absorption of water is high.
Osmoregulation of internal environment of a cell is chiefly regulated by 
  • Vacuoles
  • Plastids
  • Ribosomes
  • Mitochondria
Translocation of organic materials is best explained by
  • Active transport
  • Transpiration pull
  • Imbition theory
  • Mass flow hypothesis
Although a gridled (upto bast) tree may survive for sometime, but it will eventually die because _________________.
  • Water will not move upward
  • Water will not move downward
  • Sugars and other organic solutes will not move downward
  • Sugars and other organic solutes will not move upward
Solute potential of a solution is always 
  • = 0
  • < 0
  • > 0
  • Between 0.1 to 1.0.
Osmotic pressure of pure water is 
  • Zero atm
  • 1 atm
  • 10 atm
  • 100 atm
Mushroom is referred to as a vegetable meat because it _________________.
  • Contains proteins
  • Contains vitamins and carbohydrates
  • Contains folic acid and amino acids
  • Is rich in proteins and minerals
In 0.1 M solution of a non electrolyte, $$\psi_w$$ value will be
  • Zero bar
  • +2.3 bar
  • -2.3 bar
  • -22.4 bar
Which of the following is not true of the carrier molecules involved in facilitated diffusion?
  • They increase the speed of transport across a membrane
  • They concentrate solute molecules on one side of the membrane
  • They have specific binding sites for molecules they transport
  • Transport protein may undergo conformational change upon binding of solutes
The earliest undoubled vascular plants are found in the rocks of ______________.
  • Early Cambrian
  • Early Devonian
  • Mid-creataceous
  • Not until the beginning of Quaternary
The process of release of water through and intact plant is called.
  • Guttation
  • Exudation
  • Oozing
  • Leakage
Which of the following plant materials, is an efficient water imbibant?
  • Lignin
  • Pectin
  • Agar
  • Cellulose
In given diagram correct order of solute potential  would be (where $$'\rightarrow'$$ represents the movement of the water ): 
711416_3bde9d4ea182437aa45ee006283ae507.png
  • A < B > C
  • A = B < C
  • C > A > B
  • A= C< B
Incipient plasmolysis is
  • Last stage of plasmolysis
  • Mid stage of plasmolysis
  • Zero hour for inception of plasmolysis
  • Initial stage of plasmolysis
Choose the correct statement regarding facilitated diffusion:
  • It is fast process
  • Expenditure of ATP occurs
  • Break down the concentration gradients
  • Does not requires special membrane proteins
The mechanism of transpiration in plants is performed by:
  • Stem
  • Only leaves
  • Flowers
  • All of these
0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Class 11 Medical Biology Quiz Questions and Answers