CBSE Questions for Class 11 Medical Biology Transport In Plants Quiz 6 - MCQExams.com

Which of the following seeds develops a greater imbibition pressure?
  • Wheat seed
  • Gram seed
  • Rice seed
  • Mustard oil seed
To initiate cell plasmolysis, the soution outside the cell must be
  • Isotonic
  • Hypotonic
  • Hypertonic
  • Atonic
If three cells X, Y and Z are joined to each other and their solute potential and turgor pressure values are given in the figure; then demonstrate the direction of flow of water in this system.
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Swelling of wooden planks and door-panels during the rainly season is due to
  • Imbibition
  • Endosmosis
  • Deplasmolysis
  • Diffusion
If solute is added in a given solution, then what observation can be made?
  • Its DPD decreases.
  • Its water potential decreases.
  • DPD and water potential remains unchanged.
  • Its water potential increases.
Root pressure in maximum, when
  • Transpiration is high and absorption is very low.
  • Transpiration is very low and absorption is high.
  • Absorption is very high and transpiration is also very high.
  • Absorption is very low and transpiration is also low.
Leaves of submerged hydrophytes are
  • Epistomatic
  • Hypostomatic
  • Astomatic
  • Both A and B
Which condition favours guttation?
  • High water absorption
  • High transpiration
  • Low transpiration
  • Both A and C
The pressure exerted on the fluid contents of the cortical cells of root by turgidity, which forces the water into xylem vessels and upward into stem for a certain height is
  • Imbibition
  • Root pressure
  • Capillarity
  • None of the above
The conduction of water from root hair to root xylem is ?
  • Symplastic
  • Apoplastic
  • Osmotically
  • Symplastic and apoplastic
Guttation takes place through
  • Lenticels
  • Pneumatophores
  • Stomata
  • Hydathodes
The trunk of a tree shrinks during day time due to
  • Rapid translocation of food
  • Transpiration induced tension
  • Rapid growth in day hours
  • Light induced elongation of plant
Guttation take place during night when
  • Root pressure is positive
  • Root pressure is negative
  • Always take place
  • It does not takes place at all
The hydathodes are related with
  • Transpiration
  • Guttation
  • Bleeding
  • All of the above
Movement of gases across plasma membrane occurs through ______________
  • Osmosis
  • Diffusion
  • Imbibition
  • None of these
Guttation is dependent on
  • Root pressure
  • Active absorption
  • Flaccidity of root cortical cells
  • High rate of transpiration
What is osmosis?
  • The passive flow of water or any other solvent from a region of higher water concentration to a region of lower water concentration through a semipermeable membrane.
  • Active flow of water or any other solvent from a region of higher water concentration to a region of lower water concentration through a semipermeable membrane.
  • The passive flow of water or any other solvent from a region of lower water concentration to a region of higher water concentration through a semipermeable membrane.
  • None of these.
Cells present in hydathodes are
  • Complementary cells
  • Epithem cells
  • Guard cells
  • Kranz cells
Transpiration is
  • The absorption of water and minerals by the roots of a plant.
  • The movement of sap upward in a plant against the force of gravity.
  • The loss of water and waste material through stomata and lenticels.
  • The absorption of waste materials from the blood by nephrons.
The word Guttation was given by
  • Burgerstein
  • Sayre
  • Sacrth
  • Stephen hales
Water of guttation is
  • Pure water
  • Water with dissolved salts
  • Solution of organic food
  • Condensed water vapour
Guttation usually occur in a well watered herbaceous plant and well drained soil during
  • Early morning hours
  • Evening hours
  • Noon hours
  • Day hours
Which of the following is not a rhythmic phenomenon?
  • Stomatal opening and closing
  • Guttation
  • Nyctinasty
  • Photonastic movement
When stem of a herbaceous plant is cut, water or sap oozes out, this is due to?
  • Guttation
  • Transpiration pull
  • Root pressure
  • Imbibition
The whitish powder around hydathode is due to 
  • Guttation
  • Salt depositon from air
  • Salt formation over surface
  • Bleeding
Which option is correct in relation to opening of Hydathodes.
  • Opens during night hours.
  • Opens during day hours.
  • Opens during noon hours.
  • Are always open
Guttation occurs when plants absorb water through
  • Active absorption
  • Passive absorption
  • Root pressure
  • Both A and C
A plasmolysed cell can change again into a fully turgid cell by _________ .
  • Deplasmolysis
  • Diffusion
  • Replasmolysis 
  • Placing in hypertonic solution 
The process by which water enters a cell through a selectively permeable membrane is called ______.
  • Osmosis
  • Diffusion 
  • Metabolism 
  • Active transport 
Plasmolysis occurs due to
  • Adsorption
  • Endosmosis
  • Absorption
  • Exosmosis
The type of water movement in the plants where protoplasm is involved is called
  • apoplast movement 
  • symplast movement 
  • osmosis 
  • both a and c 
Following are a few definitions of osmosis. Read carefully and select the correct definition.
  • Movement of water molecules from a region of higher concentration to a region of lower concentration through a semipermeable membrane.
  • Movement of solvent molecules from its higher concentration to lower concentration.
  • Movement of solvent molecules from higher concentration to lower concentration of solution through a permeable membrane.
  • Movement of solute molecules from lower concentration to higher concentration of solution through a semipermeable membrane.
Which one is correct for secretion of guttation?
  • Pure water
  • Water with salts
  • Water with excretory products
  • Water with organic materials
Guttation occurs through
  • Hydathodes
  • Lenticels
  • Cuticle
  • None of these
What will be zero in fully turgid cell ________.
  • Turgor pressure
  • Wall pressure
  • Water potential 
  • Osmotic pressure 
Wooden doors and windows swell up in the rainy season by
  • A special type of diffusion called imbibition
  • Evaporation of stored water wood
  • Conduction of water from walls
  • Transpiration
Osmotic pressure of a solution is
  • More than that of pure solvent
  • Less than that of pure solvent
  • Variable depending upon concentration
  • Equal of that of pure solvent
Water potential is maximum in case ___________.
  • Pure water
  • $$2\%$$ glucose
  • $$10\%$$ glucose
  • $$10\%$$ NaCl
Wooden doors swell up during rainy season due to ___________.
  • Endosmosis
  • Imbibition
  • Capillarity
  • Exosmosis
Which is incorrect ___________________.
  • $$\psi w=\psi \pi +\psi p$$
  • $$\psi w=\psi m+ \psi\pi +\psi p$$
  • $$\psi w=\psi s+\psi p$$
  • $$\psi w=\psi m-\psi \pi+\psi p$$
Which of the following match is incorrect?
(i) Diffusion - Movement of substances from higher concentration to lower concentration
(ii) Osmosis - Occurs in only one direction
(iii) Semi-permeable membrane - Prevents passage of solute molecules
(iv) Endosmosis - Withdrawal of water from the vacuole
(v) Plasmolysis - Shrinkage of protoplasm when kept in hypotonic solution
  • (ii), (iv) & (v)
  • (iv) & (v)
  • (i), (iii) & (iv)
  • (iv) only
Amount by which water potential is reduced due to presence of solute is called ______________.
  • Pressure potential
  • Solute potential
  • Matric potential
  • None of the above
Which apparatus is used in the measurement of root pressure ______________.
  • Potometer
  • Manometer
  • Auxenometer
  • Barometer
Compensation point is
  • Where there is neither photosynthesis nor respiration.
  • When rate of photosynthesis is equal to the rate of respiration.
  • When there is enough water just to meet the requirements of plant.
  • When the entire food synthesized in photosynthesis remains unutilized.
Which one of the following is responsible for guttation?
  • Root pressure
  • Transpiration
  • Photosynthesis
  • Osmosis
The stage when plasmolysis just begins and the plasmalemma starts receding the cells walls is called as
  • Deplasmolysis
  • Plasmolysis
  • Incipient plasmolysis
  • All of the above
The process of escape of the liquid from the tip of uninjured leaf or through hydathodes is called as
  • Transpiration
  • Guttation
  • Evapo-transpiration
  • Evaporation
Which of the following prevents an ion to cross the plasma membrane via simple diffusion?
  • Ions are too large.
  • Ions carry a charge.
  • Ions are hydrophobic.
  • Ions do not produce a concentration difference.
  • Ions cannot interact with membrane-bound proteins.
The waste product of photosynthesis is 
  • Carbon dioxide
  • Oxygen
  • Nitrogen
  • None of the above
A bottle of perfume is opened in the room opposite to you and within minutes you begin to smell the perfume. This phenomenon is a classic example of
  • Dialysis
  • Osmosis
  • Active transport
  • Diffusion
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