Transport in plant

 

Q46. Select the incorrect statement w.r.t mineral uptake 

(1) Most minerals enter root by active absorption 

(2) Active uptake of ions is partly responsible for water potential gradients in roots 

(3) Some ions move into epidermal cells passively 

(4) Like water, all minerals are passively absorbed by roots

Ans.4

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Q47. Girdling experiment was used to prove that 

(1) Xylem is the water conducting channel 

(2) Phloem is not responsible for food translocation 

(3) Phloem translocates food in one direction 

(4) Food translocation by root pressure

Ans.3

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Q48. Consider the following statements (a-d) each with one or two blanks 

a. Numerically (i) is equivalent to the osmotic potential but the sign is opposite b. The water potential of(ii) at standard temperatures, which is not under any pressure is taken to be zero.

c. Minerals are present in the soil as charged particles which (iii) move across cell membranes 

d. The movement of water through the root layers is ultimately (iv) in the endodermis.

Which one of the following options, gives the correct fill ups for the respective blank numbers from (i) to (iv) in the statement? 

(1) (i) Water potential (ii) Solution 

(2) (ii) Pure water (iv) Symplastic 

(3) (i) Osmotic pressure (iii) Can 

(4) (iii) Cannot (iv) Apoplastic

Ans.2

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Q49. Find the mismatch 

(1) Transpiration - Supplies water for                    

                                  photosynthesis

(2) Guttation        - Due to root 

                                  pressure

(3) Phloem loading - Passive process 

(4) Uptake of mineral lions- Mostly

                                                   active

                                                   process

Ans.3

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Q50. All statements are correct for root pressure, except 

(1) It is the result of active absorption of solutes 

(2) It provides a modest push in the overall process of water transport 

(3) Plays a major role in water movement up tall trees 

(4) It is responsible for loss of water from tips and margin of leaves in tomato plant

Ans.3

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Q51. Select the incorrect statement w.r.t osmosis. 

(1) Refers specifically to diffusion of water across a differentially permeable membrane 

(2) Occurs spontaneously in response to a driving force 

(3) Net direction and rate depends on both pressure gradient and concentration gradient 

(4) Water moves from its region of lower chemical potential to its region of higher chemical potential

Ans.4

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Q52. Consider the following properties 

(a) Highly selective in nature 

(b) Transport saturates 

(c) Uphill transport 

(d) Movement of transport proteins 

(e) Requires ATP energy 

(f) Need of special membrane proteins In how many of the features, active transport is different from facilitated diffusion? 

(1) Three             (2) Four 

(3) Two                (4) Five

Ans.1

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Q53. Which of the following is/are the sinks for the mineral elements? 

a. Apical meristem 

b. Young leaves 

c. Developing flowers 

(1) Only a 

(2) Only b and c 

(3) Only c 

(4) All a, b and c

Ans.4

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Q54. Which of the following is not correct w.rt. mass flow hypothesis? 

(1) Water comes into phloem from adjacent xylem 

(2) Movement of sucrose into sieve tube via companion cells 

(3) At sink osmotic pressure must be increased 

(4) Movement of sugars in the phloem begins at the source

Ans.3

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Q55. Deplasmolysis occurs due to 

(1) Endosmosis of water 

(2) Exosmosis of water 

(3) Movement of water out side the cell 

(4) Both (2) & (3)

Ans.1

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Q56. Which of the following is not a feature of active transport of solutes in plants?

(1) Requires ATP 

(2) Occurs against concentration gradient 

(3) Non-selective 

(4) Occurs through membranes

Ans.3

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Q57. What will be the direction of flow of water when a plant cell is placed in a hypotonic solution?  

(1) No flow of water in any direction 

(2) Water will flow in both directions 

(3) Water will flow out of the cell 

(4) Water will flow into the cell

Ans.4

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Q58. The main difference between active and passive transport across cell membrane is 

(1) active transport occurs more rapidly than passive transport. 

(2) passive transport is non-selective whereas active transport is selective. 

(3) passive transport requires a concentration gradient across a biological membrane whereas active transport requires energy to move solutes. 

(4) passive transport is confined to anionic carrier proteins whereas active transport is confined to cationic channel proteins.

Ans.3

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Q59. What is the direction of movement of sugars in phloem? 

(1) Non-multidirectional  

(2) Upward 

(3) Downward 

(4) Bi-drectional

Ans.4

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Q60. Xylem translocates 

(1) Water only 

(2) Water and mineral salts only 

(3) Water, mineral salts and some organic nitrogen only 

(4) Water, mineral salts, some organic nitrogen and hormones

Ans.4

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