Transport of plants

 Transport of plants 

Q16. From mesophyll cells, sucrose moves into companion cells and then into the sieve tube cells by  

(1) Transpiration 

(2) Simple diffusion 

(3) Passive transport 

(4) Active transport

Ans.4

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Q17. Select the correct feature for facilitated diffusion. 

(1) Non-specific and non-selective process

(2) Does not require membrane proteins 

(3) It is an uphill transport 

(4) Rate of transport may saturate

Ans.4

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Q18. During symplastic movement of water, intercellular movement occurs through 

(1) Plasmodesmata 

(2) Cell walls 

(3) Intercellular spaces 

(4) Casparian strips

Ans.1

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Q19. Water potential is/of 

(1) Independent of any extemal pressure

(2) A cell is always positive 

(3) Pure water is zero at atmospheric pressure 

(4) A solution increases by adding solutes

Ans.3

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Q20. Read the following statements and choose the correct option. 

Statement A - Diffusion is a slow process and is not dependent on a living system

Statement B - The diffusing molecules move randomly along the concentration gradient 

(1) Only statement B is correct 

(2) Both the statements are correct 

(3) Only statement A is correct 

(4) Both the statements are incorrect

Ans.2

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Q21. The space between the cell wall and the shrunken protoplast in the plasmolysed cell is occupied by 

(1) Hypotonic solution 

(2) Isotonic solution 

(3) Hypertonic solution 

(4) Pure water

Ans.3

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Q22.  A is associated with translocation of B 

(1) A-phloem, B-organic and inorganic solutes 

(2) A-phloem. B-water and mineral salts 

(3) A-xylem, B-water and mineral salts 

(4) Both (1) and (3)

Ans.4

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Q23. The process which plays an important role in the germination of seeds and rupturing of seed coats, is 

(1) Osmosis

(2) Plasmolysis 

(3) Imbibition 

(4) Diffusion

Ans.3

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Q24. Consider the following statements and state True (T) or False (F) 

(A) The symplastic system is the system of interconnected protoplasts 

(B) Most of the water flow in the roots occurs via the apoplast 

(C) Water and other solutes can enter the vascular cylinder through symplastic pathway only

         (A).             (B).            (C)

(1)      T                 T                 F

(2)      T                 T                 T

(3)      F                 F                 T

(4)      F                 T                 F

Ans.2

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Q25. All the following properties are common in facilitated diffusion and active transport, except 

(1) Highly selective nature 

(2) Require special membrane proteins 

(3) Response to protein inhibitors 

(4) Uphill transport

Ans.4

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Q26. When sugars are loaded in the sieve tubes then 

(1) Water moves out of the sieve tubes 

(2) Hypotonic condition is developed in the seve tubes 

(3) Osmotic pressure inside the sieve tubes increases 

(4) No energy is required as phloem loading is a passive process

Ans.3

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Q27. Xylem is not associated with translocation of 

(1) Mineral salts 

(2) Organic nitrogen 

(3) Hormones 

(4) Photosynthates

Ans.4

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Q28. Sometimes facilitated diffusion is required across the cell membranes because

(1) It can move substances against their concentration gradient 

(2) It does not require energy and membrane proteins 

(3) Hydrophilic substances find difficulty to pass through the membrane 

(4) Hydrophobic substances being not soluble in lipids cannot diffuse through the membrane

Ans.3

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Q29. If the osmotic concentration of cell sap is higher than the surrounding solution then 

(1) The solution is hypertonic 

(2) The cells sap is hypotonic 

(3) The solution is hypotonic 

(4) The cell has higher Ww

Ans.3

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Q30. Both facilitated transport and active transport are 

(1) Highly selective 

(2) Uphill transport 

(3) Not dependent on special membrane proteins 

(4) Energy dependent

Ans.1