CBSE Class 11 Biology Transport In Plants MCQs Set B

Question: A Botanist discovered a mutant plant that was unable to produce materials that form casparian strip. This plant would
a) unable to transport water or solutes to the leaves.
b) unable to use its sugar as a sugar sink.
c) able to exert greater root pressure than the normal plant.
d) unable to control amounts of water and solutes it absorbs.
Answer: d

Question: Which of the following is correct regarding guttation?
a) It occurs through stomata.
b) It occurs through hydathodes.
c) It occurs mostly during night and early morning.
d) Both It occurs through hydathodes. and It occurs mostly during night and early morning.
Answer: d

Question: A cell is said to be flaccid when
a) there is no net flow of water towards the inside or outside.
b) the external solution balances the osmotic pressure of the cytoplasm.
c) water flows into the cell and out of the cell and are in equilibrium.
d) the external solution is more dilute than the cytoplasm.
Answer: c

Question: Find out the incorrect statements.
a) The process of plasmolysis is usually irreversible.
b) The pressure exerted by the protoplasts due to entry of water against the rigid walls is called yp.
c) The T.P. is responsible for enlargement and extension growth of cells.
d) Plant cells swell in hypotonic solutions.
Answer: a

Question: A boy is studying transport of a certain type of molecules into cell. He finds that transport slows down when the cells are poisoned with a chemical that inhibits energy production. nder normal circumstances the molecules studied by the boy is probably transported by
a) simple diffusion
b) osmosis
c) active transport
d) facilitated diffusion
Answer: c

Question: Transpiration facilitates
a) electrolyte balance
b) absorption of water by roots
c) opening of stomata
d) excretion of minerals.
Answer: b

Question: If a stem is girdled,
a) root dies first.
b) shoot dies first.
c) both die together.
d) none of the above.
Answer: a

Question: Water will move from its region of higher chemical potential to its region of lower chemical potential until
a) equilibrium is reached.
b) amount of both solvent and solute in both regions become equal.
c) solvent amount in both regions become equal.
d) solute amount in both regions become equal.
Answer: a

Question: Seeds when soaked in water, they imbibe because of
a) OP inside the seed is low.
b) OP of water is high.
c) DPD of seed is very much low.
d) water potential gradient between the seed coat and water.
Answer: d

Question: Read the given statement and answer the question : “Osmosis is the diffusion of a solution of a weaker concentration when both are separated by semipermeable membrane”. What s the error in the statement ?
a) The movement of solvent molecule is not specified.
b) There is no mention of DPD.
c) Behaviour of semipermeable membrane is not specified.
d) The exact concentration of solutions are not indicated.
Answer: a

Question: Which of the following the statements regarding mycorrhizae is incorrect?
a) Mycorrhizal fungi form a network around the young root and they penetrate the root cells.
b) Mycorrhizae helps the plant to absorb water and minerals.
c) Root provides sugar and nitrogenous organic compounds to the mycorrhizae.
d) Pinus seed can germinate and establish without mycorrhizae.
Answer: d

Question: The net direction and rate of osmosis depends on both the ‘X’ and ‘Y’. Identify ‘X’ and ‘Y’.
a) X – Solute; Y – Solvent
b) X – Pressure potential; Y – Solute potential
c) X – Water potential; Y – Pressure gradient
d) X – Pressure gradient; Y – Concentration gradient
Answer: d

Question: Bacteria cannot survive in a highly salted pickle because
a) salt inhibits reproduction of bacteria.
b) they become plasmolysed and death occurs.
c) nutrients in pickle cannot support life.
d) enough light is not available for photosynthesis.
Answer: b

Question: Which of the following will affect the active uptake of water?
a) Transpirational power of the root hairs.
b) Typical tissue organization.
c) Tension due to transpiration.
d) Osmotic concentration of the cell sap of the leaves.
Answer: c

Question: Osmosis is a form of diffusion in which
a) the solvent moves through a semipermeable membrane from its region of higher chemical potential to its region of lower chemical potential.
b) the solvent moves through a semipermeable membrane from its region of lower chemical potential to its region of higher chemical potential.
c) the solute moves through a semipermeable membrane from a region of higher concentration to lower concentration.
d) the solute moves through a semipermeable membrane from a region of lower concentration to higher concentration.
Answer: d

Question: Process of imbibition results in
a) increase in the volume of imbibant but without development of pressure.
b) decrease in the volume of imbibant and development of pressure.
c) no change in volume of imbibant but pressure develops.
d) increases in volume of imbibant and development of pressure.
Answer: d

Question: Which one of the following is not related to guttation?
a) Water is given out in the form of droplets.
b) Water given out is impure.
c) Water is given out during daytime.
d) Guttation is a process of universal occurrence.
Answer: d

Question: A boy has taken fresh twig from a tree and then he placed it into a coloured water. After a few hours he cut the surface of the twig and examine it with a magnifying glass to study the path of water movement. This experiment demonstrates that movement of water occurs through
a) xylem
b) phloem
c) sieve tube
d) casparian strip
Answer: a

Question: If the external solutions balance the osmotic pressure of cytoplasm, it is said to be
a) isotonic
b) hypotonic
c) atomic
d) hypertonic
Answer: a

Question: A bottle filled with previously moistened mustard seeds and water was screw capped tightly and kept in a corner. It blew up suddenly after about half an hour. The phenomenon nvolved in this is
a) diffusion
b) imbibition
c) osmosis
d) D.P.D.
Answer: b

Question: Which of the following statement is correct?
a) Unlike water, all minerals cannot be passively absorbed by roots.
b) Most of the minerals enter the root by active transport.
c) Ions are absorbed from soil by both passive and active transport.
d) All of the options
Answer: d

Question: Dry wooden stakes, if driven into a small crack in a rock and then soaked, can develop enough pressure to split the rock. Such a pressure is built up through the phenomenon of
a) imbibition
b) transpiration
c) turgor pressure
d) plasmolysis
Answer: a

Question: Stomata opens when
a) guard cells swell due to a decrease in their water potential.
b) guard cells swell up due to an increase in their water potential.
c) guard cells swell by endosmosis due to efflux of potassium ions.
d) guard cells swell by endosmosis due to influx of hydrogen ions (protons).
Answer: a

Question: ‘X’ breaks the continuity of the ‘Y’ pathway and forces water and solutes to cross the endodermis by passing through the plasma membrane. Identify ‘X’ and ‘Y’.
a) X – Suberin; Y – Tonoplast
b) X – Suberin; Y – Symplast
c) X – Casparian strip ; Y – Tonoplast
d) X – Casparian strip ; Y – Apoplast
Answer: d

Question: The movement of water from one cell of the cortex to the adjacent one in roots is due to
a) water potential gradient.
b) chemical potential gradient.
c) turgor pressure.
d) mass flow.
Answer: a

Question: Which of the following statement is incorrect regarding stomata?
a) It helps in exchange of oxygen and carbon dioxide in the leaf.
b) It is open in the day time and close during the night.
c) Opening or closing of the stomata is a change in the turgidity of the guard cells.
d) The inner wall of each guard cell, towards the stomatal aperture is thin and rigid.
Answer: d

Question: Which of the following compound is used to study water loss from a leaf and turns colour on absorbing water?
a) Calcium chloride
b) Magnesium chloride
c) Cobalt chloride
d) Sodium chloride
Answer: c

Question: Stomata closes because
a) guard cells lose turgidityand becomes flaccid
b) of increased turgidity of the guard cells brought about by exposure to light.
c) O.P. of the guard cell increases
d) of the movement of water from neighbouring cells into guard cells.
Answer: a

Question: A plant cell placed in pure water will
a) expand until the osmotic potential or solute potential reaches that of water.
b) becomes more turgid until the pressure potential of cell reaches its osmotic potential.
c) become more turgid until osmotic potential reaches that of pure water.
d) becomes less turgid until the osmotic potential reaches that of pure water.
Answer: b

Question: In part A of a plant, sugars are actively transported into the phloem tissue. In part B, sugars are actively transported out of the phloem. Which way will the phloem sap move under hese conditions?
a) From A to B.
b) From B to A.
c) First from A to B; then, once the pressure builds up, from B to A.
d) First from B to A; then, once the pressure builds up, from A to B.
Answer: a

Question: Stomata in angiosperms open and close due to
a) their genetic constitution.
b) effect of hormone.
c) changes of turgor pressure in guard cells.
d) pressure of gases inside the leaves.
Answer: c

Question: Arrange the following events in a correct order that explains the mass flow of materials in the phloem?
(i) Water diffuses into the sieve tube elements.
(ii) Leaf cells produce sugar by photosynthesis.
(iii) Solutes are actively transported into the sieve elements.
(iv) Sugar is transported from cell to cell in the leaf.
(v) Sugar moves down the stem.
a) (ii) – (iv) – (iii) – (i) – (v)
b) (ii) – (iv) – (i) – (iii) – (v)
c) (i) – (ii) – (iii) – (iv) – (v)
d) (iv) – (ii) – (i) – (iii) – (v)
Answer: a

Question: Which of the following factors affect transpiration?
(i) Number and distribution of stomata.
(ii) Percent of open stomata.
(iii) Water status of the plant.
(iv) Canopy structure.
a) (i) and (ii)
b) (i), (ii) and (iii)
c) (ii) and (iv)
d) (i), (ii), (iii) and (iv)
Answer: d

Question: Which of the following statements is/are correct?
(i) The apoplastic movement of water occurs exclusively through the cell wall without crossing any membranes.
(ii) The apoplastic movement occurs from cell to cell through the plasmodesmata.
(iii) Endodermis is impervious to water because of a band of suberised matrix.
(iv) Symplastic movement may be aided by cytoplasmic streaming which occurs in Hydrilla leaf and chloroplast.
a) (i) and (ii)
b) (ii) and (iv)
c) (i), (iii) and (iv)
d) (i), (ii) and (iv)
Answer: c

Question: Which of the following statements, (i -v) regarding transpiration is/are correct?
(i) It creates transpiration pull for absorption and transport of plants.
(ii) It supplies water for photosynthesis.
(iii) It transports minerals from the soil to all parts of the plants.
(iv) It heats leaf surfaces, sometimes 10 to 15 degrees.
(v) It maintains the shape and structure of the plants by keeping cells turgid.
a) Only (ii)
b) Only (iii)
c) (i), (ii), (iii) and (v)
d) All
Answer: c

Question: The following statements are associated with translocation of mineral ions.
(i) Mineral ions are slowly remobilised.
(ii) Younger leaves export most of their minerals content to older leaves.
(iii) Elements most readily mobilised are P, S, N and K.
(iv) Some elements that are structural components like calcium are not remobilised. Which of the above statements are correct?
a) (i) and (iii)
b) (i) and (ii)
c) (iii) and (iv)
d) (ii) and (iii)
Answer: c

Question: Which of the following statements is/are not incorrect?
(i) Water and minerals, and food are generally moved by a mass or bulk flow system.
(ii) Bulk flow can be achieved either through a positive hydrostatic pressure gradient or a negative hydrostatic pressure gradient.
(iii) The bulk movement of substances through the conducting tissues of plants is called translocati
(iv) Xylem translocates organic and inorganic solutes, mainly from roots to the aerial parts of the plants.
(v) Phloem translocates water, mineral salts, some organic nitrogen and hormones, from the leaves to other parts of the plants.
a) (ii), (iii) and (v)
b) (ii), (iii) and (iv)
c) (iv) and (v)
d) (ii) and (v)
Answer: c

Question: Match the name of the activities given under column-I with the description of activity given under column-II and choose the correct option.
Column-I                                         Column-II
A. Cohesion                       I. The ability to rise in their tubes.
B. Adhesion                       II. Loss of water vapour from plant parts.
C. Tensile strength            III. Mutual attraction between water molecules
D. Capillarity                     IV. Attraction of water molecules to polar surfaces
                                          V. An ability to resist a pulling force.
a) A – I; B – II; C – III; D – V
b) A – II; B – I; C – IV; D – III
c) A – III; B – IV; C – V; D – I
d) A – IV; B – V; C – II; D – III
Answer: c

Question: Match column-I with column-II and find out the correct answer from the code given below.
Column-I                           Column -II
A. Diffusion                     I. Hydrophilic substances
B. Osmosis                    II. Shrinkage of protoplasm
C. Imbibition                  III. Semipermeable membrane
D. Plasmolysis              IV. Free movement of ions and gases
a) A – II; B – I; C –IV; D – III
b) A – IV; B – III; C – I; D – II
c) A – III; B – I; C – IV; D – II
d) A – II; B – III; C – IV; D – I
Answer: b

Question: Match the name of the activities given under column-I with the description of activity given under column-II and choose the correct option.
Column-I                                       Column-II
A. Transpiration               I. Anaerobic respiration in yeast
B. Guttation                    II. Active absorption of water
C. Exudation                  III. Loss of water vapour from plant parts
D. Fermentation             IV. Loss of liquid water from leaves
                                        V. Loss of water from injured plant parts
a) A – I; B – II; C – III; D – V
b) A – II; B – I; C – IV; D – III
c) A – III; B – IV; C – V; D – I
d) A – IV; B – V; C – II; D – III
Answer: c