CBSE Questions for Class 11 Medical Biology Transport In Plants Quiz 9 - MCQExams.com

Plant cells kept in hypertonic solution will get 
  • Lysed
  • Turgid
  • Deplasmolysed
  • Plasmolysed
The term water potential was coined by 
  • Sayre
  • Von Mohl
  • Lloyd
  • Slatyer and taylor
The movement of free atoms from higher concentration to lower concentration is called:
  • Osmosis
  • Diffusion
  • Endosmosis
  • Exosmosis
Diffusion of water through selectively permeable membrane is 
  • Diffusion
  • Imbibition
  • Osmosis
  • Translocation
Plants obtain mineral nutrients from.
  • Rocks
  • Breakdown products of rocks
  • Soil
  • All the above
In seed germination the first step that occurs is :
  • Diffusion
  • Osmosis
  • Imbibition
  • All the above
Cotton fibres dipped in water absorb water through
  • Endosmosis
  • Exosmosis
  • Capillarity
  • Imbibition
In osmosis, the volume of solvent (in solution) will 
  • Decrease
  • Increase
  • Remain constant
  • Volume has no relation to osmosis
Plasmolysis is due to :
  • Exosmosis
  • Endosmosis
  • Osmosis
  • Adsorption
Water exudation through hydathodes is 
  • Guttation
  • Transpiration
  • Hydrolysis
  • Excretion
Potato slices were placed in sucrose solution. After half an hour, density of sucrose solution increased. Water potential of Potato tuber is 
  • Equal to solute potential of sucrose solution
  • Greater than solute potential of sucrose solution
  • Less than solute potential of sucrose solution
  • Half the concentration of sucrose solution
The movement of water from one cell of cortex to the next in the root is due to 
  • Water potential gradient
  • Chemical potential gradient
  • Accumulation of inorganic salts in the cells
  • Accumulation of organic salts in the cells
Root pressure is due to  
  • Active absorption/ transportation
  • Passive absorption/ transport
  • Increased transpiration
  • Increased photosynthesis
Cells absorb water through 
  • Osmosis only
  • Imbibition only
  • Guttation
  • Both osmosis and imbibition
A leafy twig of mesophytic plant dipped in water would demonstrate 
  • Photosynthesis
  • Transpiration
  • Respiration
  • Gutttation
Water absorbed by root to meet the requirement of transpiration is possible due to 
  • Diffusion
  • Osmosis
  • Imbibition
  • Plasmolysis
Dry wooden stakes driven in cracks of a rock and soaked will develop pressure that will split the rock. The phenomenon is 
  • Osmotic pressure
  • Imbibition
  • Turgor pressure
  • Deplasmolysis
Osmotic potential is depicted as 
  • (-)
  • (+)
  • (X)
  • (0)
Water potential in leaf tissue is 'positive' (near zero) during 
  • Low transpiration
  • Excessive absorption
  • Excessive transpiration
  • Guttation
Epithem is associated with 
  • Respiration
  • Guttation
  • Transpiration
  • Photosynthesis
Loss of water from tips of leaves is 
  • Transpiration
  • Guttation
  • Bleeding
  • Respiration
Shrinking of protoplasm from cell wall under influence of hypertonic solution is 
  • Plasmolysis
  • Apoptosis
  • Deplasmolysis
  • Flaccidity
Wooden doors swell up and get stuck during rainy season due to 
  • Endosmosis
  • Imbibition
  • Capillarity
  • Exosmosis
Plants lose most of water through leaves by 
  • Respiration
  • Guttation
  • Photosynthesis
  • Transpiration
Guttation is due to 
  • Negative root pressure
  • Positive root pressure
  • Transpiration
  • None of the above
In the experiment to demonstrate root pressure, where did the cut was made on the plant? 
  • At the tip
  • Transition zone
  • A few centimeters above the soil
  • A few centimeters below the soil
Munch hypothesis is based on translocation of food due to
  • Imbibition force
  • Turgor pressure (TP) gradient
  • Both A and B
  • None of these
Amount by which water potential is reduced due to presence of solute is called 
  • Pressure potential
  • Solute potential
  • Matric potential
  • None of the above
Pea seeds absorb more water and swell up more as compared to paddy seeds due to 
  • Higher imbibition by proteins present in pea seeds
  • High osmotic potential of pea seeds
  • Paddy covering is impermeable to water
  • All of the above
Flaccidity is
  • Distended nature of plant cell.
  • Percentage gain in volume of cell due to endosmosis.
  • Loss of turgidity.
  • Volume of cell in isotonic solution.
A cell when dipped in 0.5 M sucrose solution has no effect but when the same cell is dipped in 0.5 M NaCl solution, it will 
  • Increase in size
  • Decrease in size
  • Becomes turgid
  • Gets plasmolysed
In pickles, infection is rare due to 
  • Plasmolysis
  • Decrease in water potential by salt
  • Increase in osmotic potential by salt
  • Decrease in temperature by salt
A fully turgid cell has
  • Minimum cell size
  • Minimum water content
  • Maximum solute pressure
  • Minimum solute pressure
Force developed in cortex of root which pushes water into xylem of root is 
  • Root pressure
  • Turgor pressure
  • Osmotic pressure
  • Diffusion
Maximum solute pressure occurs in a cell with
  • Maximum size
  • Plasmolysis
  • Full turgidity
  • Little or no vacuole
Water potential is maximum in case of
  • Pure water
  • 2% glucose
  • 10% glucose
  • 10% NaCl
Potential energy of water is
  • Osmotic potential
  • Water potential
  • Gravity potential
  • Pressure potential
Which of these is a unit of measurement of water potential/osmotic pressure?
  • Watts
  • Joule
  • Pascal
  • Litre
Minimum solute potential means
  • More negative solute potential
  • Minimum solute concentration
  • Maximum turgidity
  • Both B and C
Water potential of water is not affected by
  • Concentration of dissolved substances.
  • Gravitation
  • Capillarity
  • Atmospheric pressure
Which one is the correct equation for water potential?

($$ \Psi_w$$ = total water potential, $$ \Psi_s$$ = solute potential, $$ \Psi_p$$ = pressure potential, $$ \Psi_g$$ = gravity potential, $$ \Psi_m$$ = matric potential) 
  • $$ \Psi_w = \Psi_s - ( \Psi_m+ \Psi_p + \Psi_g) $$
  • $$ \Psi_w = \Psi_s - \Psi_m - \Psi_p + \Psi_g$$
  • $$ \Psi_w = \Psi_m + \Psi_s + \Psi_p + \Psi_g$$
  • $$ \Psi_w = \Psi_s + \Psi_p - \Psi_m - \Psi_g$$
Which of these statements is incorrect.
  • Water potential is chemical potential of water.
  • Solute potential is always negative.
  • Pressure potential is zero in a flaccid cell.
  • Water potential is equal to solute potential in a fully turgid cell.
Which among these one is the most efficient imbibant?
  • Pectin
  • Agar
  • Cellulose
  • Lignin
Water is lost through hydathodes. Hydathodes 
  • Remain closed at night
  • Remain closed during day
  • Always remain open
  • Remain open during day
The physiological process, osmosis can be demonstrated using 
  • Potometer
  • Bell jar experiment
  • Thistle funnel whose mouth is tied with egg membrane.
  • Thistle funnel whose mouth is tied with paper.
Root pressure is higher when;
  • Transpiration is very high and absorption is high.
  • Transpiration is low and absorption is low.
  • Transpiration is high and absorption is low.
  • Transpiration is low and absorption is high.
Guttation occurs when
  • Wind velocity is high
  • Humidity increases
  • Root pressure is less and transpiration rate is more.
  • Root pressure is more and transpiration rate is less.
State true or false.
Diffusion is more rapid in liquid than in gases.
  • True
  • False
Cell wall shows
  • Semi permeability
  • Selective permeability
  • Complete permeability
  • Impermeability
Solute potential of a solution is always
  • = 0
  • < 0
  • > 0
  • Between 0.1 - 1.0
0:0:1


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