CBSE Questions for Class 11 Medical Biology Transport In Plants Quiz 12 - MCQExams.com

Mass flow hypothesis was first described by ___________.
  • Swanson
  • Buchman
  • Kursanov
  • Munch
Following are the differences between apoplast pathway and symplast pathway. Which of the given differences is/are incorrect?
Apoplast pathwaySymplast pathway
(i)It consists of non-living parts of plant body, i.e., cell walls and intercellular spaces.It consists of living parts of plant body, i.e., protoplasts connected by plasmodesmata.
(ii)There is little resistance in the movement of water.Some resistance occurs in the movement of water through symplast.
(iii)It is slightly slower.It is faster.
(iv)Metabolic state of root directly affects apoplast pathway.Metabolic state of root does not affect symplast pathway.
  • (iii) only
  • (i) and (iii) only
  • (iii) and (iv) only
  • (ii) and (iii) only
Arrange the following in the increasing power of imbibition
Agar agar, cellulose, pectin, starch
  • Agar agar > cellulose > pectin > starch
  • Cellulose > starch > agar agar > pectin
  • Agar agar > pectin > starch > cellulose
  • Cellulose > agar agar > starch > pectin 
Match column I with column II and select the correct option from the codes given.
Column IColumn II
A. Dixon and Jolly(i) Root pressure
B. Stomata(ii) Only water available to plants
C. Manometer(iii) Transpiration
D. Capillary water(iv) Transpiration pull
E. Potometer(v) Rate of transpiration
  • A-(iv), B-(iii), C-(v), D-(ii), E-(i)
  • A-(i), B-(iii), C-(iv), D-(ii), E-(v)
  • A-(iv), B-(iii), C-(i), D-(ii), E-(v)
  • A-(v), B-(iv), C-(iii), D-(ii), E-(i)
For a plasmolysed cell, which equation is correct?
  • DPD = OP + TP
  • DPD = - TP
  • DPD = OP
  • DPD = OP - TP
Cell A and Cell B are adjacent plant cells. In cell A $$\psi_s = -20$$ bars and $$\psi_p = 8$$ bars. In cell B, $$\psi_s = -12$$ bars and $$\psi_p = 2$$ bars. Then,
  • water moves from cell A to cell B
  • there is no movement of water between cell A and cell B
  • water moves from cell B to cell A
  • equal amount of water is simultaneously exchanged between cell A and cell B.
The factor which does not affect the rate of alveolar diffusion is ______.
  • solubility of gases
  • thickness of the membranes
  • pressure gradient
  • reactivity of the gases.
Which of the following is an example of imbibition?
  • Uptake of water by root hair
  • Exchange of gases in stomata
  • Swelling of seed when put in soil
  • Opening of stomata
Which of the following is true/false regarding transport of substances in plants?
(i) Mass flow is the movement of substance in bulk as a result of pressure difference.
(ii) Bulk flow is achieved only through a positive hydrostatic pressure gradient.
(iii) The apoplast system is the system of interconnected protoplasts.
(iv) Most of the water flow in the roots occurs via the apoplast since the cortical cells are loosely packed, and offer no resistance to water movement.
  • (i) and (iv) are true; (ii) and (iii) are false.
  • (i) and (ii) are true; (iii) and (iv) are false.
  • (ii) and (iii) are true; (i) and (iv) are false.
  • (i), (ii) and (iv) are true; (iii) is false.
A solution which can cause osmotic entry of water into is known as _______.
  • Hypertonic solution
  • Semi-osmotic solution
  • Osmotically active solution
  • Osmotic solution
When a molecule moves across a membrane independent of other molecules, the process is called
  • Uniport
  • Symport
  • Antiport
  • None of these
A 10% solution of which of the following substance shall have maximum osmotic potential
  • NaCl
  • Sucrose
  • Glucose
  • Fructose
Facilitated diffusion can be differentiated from active transport except
  • Energy does not required
  • Show saturation effect
  • Accumulation of molecule
  • (1) and (3) both
Faciliated diffusion
  • Doesn't involves permease and doesn't require energy
  • Involves a permease but does not require energy
  • Require energy but does not involves a permease
  • Moves substances from a region of lower concentration to a region of higher concentration
When a bottle of scent or ammonia is opened in one corner of a room, it can be smelled at the farthest corner after sometimes due to the process of diffusion. At this stage, an equilibrium is reached due to the same concentration in space. At this point,
  • The movement of particles stops
  • The movement of particles continues
  • The movement of particles becomes very fast
  • None of these
The two chambers, A and B, containing solution are separated by a semipermeable membrane.
In which direction will osmosis occur?
1069691_e0fb388709124084b3a802be1a1fa773.jpg
  • A $$\rightarrow$$ B
  • B $$\rightarrow$$ A
  • Osmosis will not occur
  • Cannot be determined
Which relationship is considered correct for a solution in beaker?
  • $${ \Psi }_{ w }={ \Psi }_{ s }+{ \Psi }_{ p }$$
  • $${ \Psi }_{ s }={ \Psi }_{ w }+{ \Psi }_{ p }$$
  • $${ \Psi }_{ w }={ \Psi }_{ s }$$
  • $${ \Psi }_{ p }={ \Psi }_{ w }$$
What will be the direction of movement of solvent according to following diagram?
1056153_daf7283d5100456d901405f0d7e07159.png
  • A to B
  • B to A
  • Hypertonic solution to hypotonic solution
  • No movement
The two chambers, A and B, containing solution are separated by a semipermeable membrane.
The solution of which chamber has a lower water potential?
1069660_abe439ef32dd44bf875161be233e1bb3.jpg
  • A
  • B
  • Both has the same water potential
  • Cannot be determined
You are monitoring the diffusion of a coloured molecules across a membrane. Which of the following result in the fastest rate of diffusion?
  • An internal concentration of 5% and an external concentration of 60%
  • An internal concentration of 35% and an external concentration of 40%
  • An internal concentration of 60% and an external concentration of 5%
  • A and C are correct
Which of the following is an incorrect match
  • Osmometer = measure rate of osmosis
  • Potometer = measure rate of transpiration
  • Porometer = measure area of stomata on leaf
  • Cobalt- chloride test = comparision of transpiration by two surface of a leaf
Water channel consists of how many type of aquaporins?
  • 1
  • 80
  • 8
  • 9
In 0.1 M solution of a non-electolyte , $$\psi$$$$_w$$Ψ (water potential) value will be
  • zero bar
  • + 2.3 bar
  • -2.3 bar
  • -22.4 bar
1$$Na^+$$/$$K^+$$ pump  Active transport
2Movement of neutral molecules across the membrane
Can be a passive transport
3Bulk intake of a solid substanceEndocytosis
4Movement of polar molecules across the membraneSimple diffusion
Select the incorrect match.
  • 1
  • 2
  • 3
  • 4
The two chambers, A and B, containing solution are separated by a semipermeable membrane.
Which solution has a higher solute potential?

1069709_f203cbf53fff401a963a9e4c56f501be.jpg
  • A
  • B
  • Both has the same solute potential
  • Cannot be determined
The value of pure water potential is
  • Always positive or more than zero
  • Always negative or less than zero
  • Always zero
  • Variable in different solution
Cell A has water potential of $$-3$$ bars and cell B has water potential of $$-8$$ bars. The movement of water will be from
  • Cell B to Cell A
  • Data insufficient
  • Cell A to Cell B
  • No movement observed
What are the aquaporins in facilitated diffusion process ?
  • Membrane proteins
  • Carrier proteins
  • Channel proteins
  • Carrier lipids

The diagram below shows two solutions that are separated by a semi-permeable membrane. In which direction will most water molecules move?
1092303_69dee23aac624bc1b13efb7d7de825b6.png
  • From X to Y, decreasing the concentration gradient of sucrose
  • From X to Y, increasing the concentration gradient of sucrose
  • From Y to X, decreasing the concentration gradient of sucrose
  • From Y to X, increasing the concentration gradient of sucrose
Lenticels are associated with
  • Absorption of moisture
  • Photosynthesis
  • Gaseous Exchange
  • Mineral uptakes
In herbaceous plants 'guttation' takes place by 
  • Stomata
  • Hydathodes
  • Root hair
  • Flowers
When pea seeds and wheat seeds are put in water, which of the two will imbibe more water?
  • Wheat seeds
  • Pea seeds
  • Both will imbibe equal amount of water
  • Pea seeds imbibe water only at alkaline pH
Carbon dioxide moves out of the cell by diffusion, when:
  • Concentration of carbon dioxide is more outside the cell than inside the cell
  • Concentration of carbon dioxide is less outside the cell than inside the cell
  • Concentration of carbon dioxide inside the cell is same as outside the cell
  • Concentration of oxygen is more inside the cell than outside the cell
Choose correct statement.
  • Nitrogen is transported in plant xylem mainly in organic form
  • P and S are carried mainly in organic compounds in plants
  • There is no exchange of material between xylem and phloem
  • Xylem transport only inorganic nutrients
Which force arises between the water molecules of leaves due to transpiration?
  • Cohesive forces
  • Pressure force
  • Suction force
  • Adhesive force
When a cell is placed in pure water then?
  • Wall pressure is increased
  • Turgor pressure is increased
  • Water potential of cell is increased
  • All the above
Which condition will not favour guttation?
  • High moisture
  • High DPD in leaf
  • Accumulation of ions in root side
  • Low light intensity
Some plants grow in the marshy saline areas show a unique adaptive response. They accumulate $$Na^+$$ and $$Cl^-$$ ions and transport them to the leaves. This phenomenon helps them to 

(a) make $$\Psi_w$$ of leaves less negative
(b) reduce the transpirational loss of water
(c) increase the uptake of water via roots
(d) make the leaves more succulent

Select the correct option:-
  • (a) and (c)
  • (a) and (b)
  • (b) and (c)
  • (c) and (d)
Which of the following are absorbed by the mechanism of facilitated transport with the help of the carrier proteins
  • Glucose and amino acids
  • Fructose and alcohol
  • Fats and glucose
  • Fats and amino acids
Which pressure is responsible for ascent of sap?
  • Negative hydrostatic pressure
  • Positive hydrostatic pressure
  • Root pressure
  • All of the above
Root pressure is caused by
  • Osmosis
  • Diffusion
  • Passive transport
  • Uphill transport
What happens when wilted vegetable are dipped in water
  • They regain their size
  • Remain to be same
  • Colour will change
  • Decrease in size because of lose of water
Rate of diffusion of $$CO_2$$ is $$20$$ times higher than $$O_2$$, as it depends upon?
  • Solubility of gases
  • Partial pressure
  • Thickness of membrane
  • All of these
Read the given statements and select the correct option.
Statement 1: Plasmolysis is bursting of the cell membrane when a cell is kept in a hypertonic solution.
Statement 2: Hypertonic solution causes endosmosis.
  • Both statements 1 and 2 are correct
  • Statement 1 is correct but statement 2 is incorrect
  • Statement 1 is incorrect but statement 2 is correct
  • Both statements 1 and 2 are incorrect.
Diffusion pressure is directly proportional to:
  • Concentration of molecules diffusing
  • Kinetic energy of diffusing molecule
  • Concentration gradient
  • All of the above
Photolysis of water used in 
  • Reduction of NADP
  • Oxidation of NADP
  • Oxidation of FAD
  • None
Identify the correct sequence of movement of water in the root of higher plants.
  • Epidermic - Cortex -Pericycle-endodermis - phloem
  • Epidermis -Cortex-endodermis -pericycle -phloem
  • Epidermis -Cortex -pericycle-endodermis -xylem
  • Epidermis -Cortex-endodermis-pericycle -xylem
Mark true statement about apoplast pathway.
  • Apoplast pathway may be aided by cytoplasmic streaming
  • Apoplast pathway is continuous throughout the plant without any exception
  • Apoplast pathway is faster than symplast pathway
  • In Apoplast pathway mass flow of water occurs through plasmodesmata
Guttation is found in
  • Mirabilis
  • Colocoasio
  • Mango
  • Ficus
Force responsible for exudation of liquid drops from the margin of the leaves is
  • Negative hydrostatic
  • Transpiration pull
  • Imbibition
  • Positive pressure
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