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NEET CRASH COURSE PAPER -9 | Transport In Plants 

1. Cell A and cell B are adjacent plant cells. In cell A, ΨS = -20 bars and ΨP = 8 bars. In cell B, ΨS = -12 bars and ΨP = - 2 bars. Then,
(a) water moves from cell A to cell B
(b) there is no movement of water between cell A and cell B
(c) water moves from cell B to cell A
(d) equal amount of water is simultaneously exchanged between cell A and cell B.

2. Refer the given figure. What does it represent ?

(a) Simple diffusion
(b) Facilitated diffusion
(c) Osmosis
(d) Active transport

3. What is correct about the movement of substances across the membrane in facilitated diffusion?
(a) It is an active transport.
(b) It causes transport of molecules from low concentration to high concentration.
(c) It is insensitive to inhibitors.
(d) It is a very specific transport.

4. Solute potential of a solution is always
(a) =0
(b) >0
(c) <0
(d) between 0-1.

5. Which one of the following is a driving force for the process of passive absorption of water in roots?
(a) The increase in imbibitional pressure in root cells
(b) Root pressure
(c) Activity of aquaporins
(d) Transpiration in leaves

6. Active transport is characterised by
(a) requirement of special membrane proteins
(b) highly selective nature
(c) requirement of ATP energy
(d) all of these.

7.  The process by which water is absorbed by solids like colloids causing them to increase in volume is called
(a) osmosis
(b) plasmolysis
(c) imbibition
(d) diffusion.

8. 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 night.
(d) Guttation occurs in all plants.

9. The given figure shows set up of potato osmoscope experiment. Select the option that correctly identifies the labels A, B and C.

               A                            B                              C
(a)  Peeled potato          Water                    Sugar solution
(b) Peeled potato           Sugar solution     Water
(c) Unpeeled potato      Sugar solution      Water
(d) Unpeeled potato      Water                     Sugar solution

10. The given figure shows transport of two molecules A and B through three different modes of facilitated diffusion. Select the correct option regarding I, II and III.

             I               II              III
( a ) Uniport   Symport    Antiport
( b ) Uniport   Antiport    Symport
( c ) Antiport   Uniport    Symport
( d ) Antiport   Symport   Uniport

11. Select the correct statement .
( a ) Absorption of water by seeds and dry wood are examples of facilitated diffusion .
( b ) The translocation in phloem is unidirectional whereas in the xylem it is bidirectional .
( c ) In plants , the water loss in its liquid phase is known as transpiration .
( d ) None of these

12. The given figure shows translocation of organic solutes according to mass flow hypothesis . High turgor pressure and lower osmotic concentration will be at

( a ) supply end

( b ) sink end
( c ) supply end and sink end respectively
( d ) sink end and supply end respectively .

13. A plant cell was put into a solution of substance A at a concentration of 200 mmol / L . The rate of uptake into the cell was measured as 5 mmol per minute When the cell was placed in a solution of substance at a concentration of 400 mmol / L , the rate of uptake was 10 mmol per minute . When the experiment was repeated with substance B , the rate of uptake was 10 mmol per minute at both concentrations of substance . Which of the following provides the explanation of the results ?
( a ) Substance A appears to move into the cell by active transport , and B by diffusion
( b ) Substances A and B appear to move into the cell by passive transport .
( c ) Substances A and B appear to move into the cell by active transport .
( d ) Substance A appears to move into the cell by diffusion , and B by active transport .

14. Two cells A and B are contiguous . Cell A has osmotic pressure 10 atm , turgor pressure 7 atm and diffusion pressure deficit 3 atm . Cell B has osmotic pressure 8 atm , turgor pressure 3 atm and diffusion pressure deficit 5 atm . The result will be
( a ) no movement of water between two cells
( b ) equilibrium between the two cells
( c ) movement of water from cell A to cell B
( d ) movement of water from cell B to cell A.

15. Which of the following statements is correct ?
( a ) DPD always has a positive value and water potential always has a negative value
( b ) DPD always has a negative value and water potential always has a positive value
( c ) both DPD and water potential have always positive values
( d ) both DPD and water potential have alway negative values .

16. Wilting of plant occurs if
( a ) xylem is blocked
( b ) phloem is blocked
( c ) epidermis and few roots are removed
( d ) pith is removed .
17. The continuation of excretion of watery liquid for sometime from the stump of a well watered pot plant after cutting off the shoot slightly above the base is due to
( a ) cohesive force of water
( b ) transpiration pull
( c ) absorption of minerals by roots
( d ) root pressure .

18. In potato osmometer , which of the following process is involved ?
( a ) Physical process
( b ) Ohysiological process
( c ) Chemical process
( d ) Physico - chemical process

19. A cell when dipped in 0.5 M sucrose solution has no effect but when the same cell will be dipped in 0.5 M NaCl solution the cell will
( a ) increase in size
( b ) decrease in size
( c ) will be turgid
( d ) will get plasmolysed .

20. What will be the direction of net osmotic movement of water if solution ' A ' , enclosed in a semipermeable membrane , having an osmotic potential of ' -30 ' bars and turgor pressure of ' 5 ' bars is submerged in a solution ' B ' with an osmotic potential of ' -10 ' bars and ' 0 ' turgor pressure ?
( a ) B to A
( b ) Equal movement in both directions
( c ) A to B
( d ) No movement

21. The most accepted theory for ascent of sap is
( a ) Munch theory
( b ) root pressure
( c ) starch theory
( d ) transpiration pull

22. Match the theories given in column I with the names of scientists listed in column II . Choose the answer which gives the correct combination of the alphabets .
   Column I ( Names of theories )    Column II ( Names of scientists )
A. Relay pump theory                        p.  Stocking
B. Transpiration cohesion theory    q. Sir J.C. Bose
C.  Mass flow                                       r. Godlewsk
D. Pulsation theory                             s. Dixon and Joly
                                                               t. Ernst Munch
( a ) A = r ; B = s ; C = t ; D = q
( b ) A = s ; B = r ; c = p ; d = q
( c ) A = r ; B = q ; C = t ; D = p
( d ) A = q ; B = p ; C = t ; D = r

23. The following figure shows the stomatal apparatus . Identify the parts labelled as A , B , C and D. Choose the correct answer from the following .

( a ) A = Guard cells , B = Stoma , C = Chloroplasts , D = Subsidiary cells
( b ) A = Subsidiary cells , B = Chloroplasts , C = Stoma , D = Guard cells
( c ) A = Guard cells , B = Chloroplasts , C = Stoma D = Subsidiary cells
( d ) A = Subsidiary cells , B = Stoma , C = Chloroplasts , D = Guard cells

24. In higher plants , continuity of cytoplasm from one cell to its neighbouring cells is established through
( a ) apoplast
( b ) chloroplast
( c ) leucoplast
( d ) symplast .

25. Glucose is not stored in plant as it causes
( a ) decrease in osmotic pressure
( b ) increase in osmotic pressure
( c ) decrease in turgor pressure .
( d ) none of these .

26. Which of the following is not a purpose of transpiration ?
( a ) Supplies water for photosynthesis
( b ) Helps in translocation of sugars from source to sink
( c ) Maintains shape and structure of the plants
( d ) Cools leaf surfaces

27. Compare the statements A and B. Statement A : To counteract the increase in turgor pressure in plant cells , the cell wall produces an equal and opposite pressure , i.e. , wall pressure .
Statement B : When plant cells undergo endosmosis , they swell but do not burst
( a ) Both the statements A and B are correct and A is the reason for B.
( b ) Statement A is correct and statement B is wrong .
( c ) Statement A is wrong and statement B is correct .
( d ) Both the statements A and B are correct but A is not the reason for B.

28. According to Steward's starch hydrolysis theory which one of the following is the principle reason for the opening of stomata during daytime ?
( a ) Influx of K + ions into guard cells under the Influence of ABA hormone
( b ) Conversion of sugar into starch in guard cells
( c ) Efflux of K + ions from guard cells under the Influenc of ABA hormone
( d ) Photosynthetic utilization of CO₂ in guard cells

29. The space between the plasma membrane and the cell wall of a plasmolysed cell surrounded by a hypertonic solution is occupied by the
( a ) hypotonic solution
( b ) isotonic solution
( c ) hypertonic solution
( d ) water .

30. Two per cent solution of NaOH as compared to 18 per cent solution of glucose is
( a ) iso - osmotic
( b ) hypo - osmotic
( c ) hyper - osmotic
( d ) none of these .

31. For a plasmolysed cell which equation is correct ?
( a ) DPD = OP + TP
( b ) DPD = -TP
( c ) DPD = OP
( d ) DPD = OP - TP .

32. Consider the following statements with reference to facilitated transport .
A. Requires ATP energy
B. Transport saturates
C. Highly selective
D. Requires special membrane proteins
E. Uphill transport
Of the above statements
( a ) A , B and C are relevant but D and E are irrelevant
( b ) B , C and E are relevant but A and D are irrelevant
( c ) C , D and are relevant but A and B are irrelevant
( d ) B , C and D are relevant but A and E are irrelevant .

33. Which of the following is the correct pathway of absorbed water in the roots of plants ?
(a) Soil water → root hair cell →cortical cells → pericycle → passage cells → xylem
( b ) Soil water → root hair cell → passage cells → cortical cells → xylem → pericycle
( c ) Soil water → root hair cell → pericycle → cortical cells → passage cells → xylem
( d ) Soil water → root hair cell → cortical cells → passage cells → pericycle → xylem

34. Stomata on the surface of the leaf , open when there is
( a ) a decrease in the solute concentration in the guard cells
( b) an increase in the solute concentration in the guard cells
(c) weakening of the cell walls of the guard cells to allow them to stretch
( d ) an increase in concentration of CO₂ in the guard cells .

35. An osmometer is filled with 0.5 M solution of NaCl in water . In which of the following solutions of NaCl it must be immersed in order to make it shrink ?
( a ) 0.5 M solution
( b ) 0.05 M solution
( c ) Distilled water
( d ) 0.75 M solution

36. Which of the following is not true for active transport ?
( a ) It is a chemical process .
( b ) Energy required for this process is obtained in the form of ATP .
( c ) It takes place through special organic molecules called carrier molecules .
( d ) This process is not modified by enzymes .

37. Living cells placed in isotonic solution ( 0.9 % saline ) retain their size and shape . This is based on the concept of
( a ) osmosis
( b ) diffusion
( c ) facilitated diffusion
( d ) transpiration .
38. The ability to rise in thin tubes and the ability to resist a pulling force are respectively referred to as
( a ) tensile strength and capillarity
( b ) adhesion and capillarity
( c ) cohesion and adhesion
( d ) capillarity and tensile strength .

39. Strips of the same plant tissue were immersed in a range of sucrose solution of different concentrations .Their lengths were measured before immersion and after 30 minutes of immersion in different solutions The graph shows the ratio of initial length to final length .
Which concentration of sucrose solution has the same water potential as that of cell sap ?

( a ) 0.1
( b ) 0.25
( c ) 0.45
( d ) 0.6

40. When a cell is plasmolysed , it becomes
( a ) flaccid and its TP becomes 0
( b ) turgid and its TP becomes 0
( c ) turgid and TP becomes equal to OP
( d ) flaccid and DPD becomes 0 .

41. Loss of liquid water by guttation occurs through
( a ) cuticle
( b ) hydathodes
( c ) bark
( d ) stomata .

42. According to H+ _ K + exchange pump mechanism of stomatal movement , which of the following is correct for stomatal opening during day time ?
i. K+ ions accumulate in guard cells during day .
ii.H+ ions are pumped out from guard cells and K+  ions are pumped into guard cells .
iii . Water potential of guard cells decreases with the accumulation of K + ions together with Cl- and organic acid ions .
iv . Water enters into guard cells from epidermal and mesophyll cells due to decreased water potential of guard cells .
( a ) i and ii only
(b) i , ii and iv only
( c ) ii , iii and iv only
( d ) All of these

43. Three cylinders , each closed by a membrane permeable to water and containing a different fluid , are placed in the same solution . After adjusting to the solution , the fluid rises in one of the cylinders remains the same in another , and falls in the third . What is the concentration of the solution in which the cylinders have been placed ?

( a ) 0 % salt solution ( distilled water)
( b ) 2.5 % salt solution
( c ) 5.0 % salt solution
( d ) 10.0 % salt solution

44. Which cells on grass leaves help in minimising cuticular transpiration ?
( a ) Guard cells
( b ) Bulliform cells
( c ) Subsidiary cells
( d ) Endodermal cells

45. When an oak tree is kept in a poisonous solution , water rises to the top of the tree , although the tree is ready to take another supply of poisonous solution followed by uptake of even pure water . This shows that
( a ) living cells are not involved in ascent of sap
( b ) living cells play a major role in ascent of sap
( c ) both xylem and phloem play a major role ascent of sap
( d ) living cells play 60 % role and vessels of xylem play 40 % role in ascent of sap

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Ans key

1. C, 2.B, 3D, 4.C, 5.D, 6.D, 7.C, 8.D, 9.B, 10.B, 11.D, 12.C, 13.D, 14.C, 15.A, 16.A, 17.D, 18.D, 19.B, 20.C, 21.D, 22A, 23.C, 24.D, 25.B, 26.B, 27.A, 28.D, 29.C, 30.B, 31.C, 32.D, 33.D, 34.B, 35.D, 36.A, 37.A, 38.D, 39.C, 40.A, 41.B, 42.D 43.C, 44.B, 45.A

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