Transport in Plants
| 1. The pressure at which the entry of water across the semipermeable membrane stops is called ____________
a) Turgor pressure b) Root pressure c) Osmotic pressure d) Diffusion pressure Answer: c |
| 2. A _______________ force exists between the walls of xylem vessels and water
a) Cohesion b) Adhesive c) Gravitational d) Transpirational pull Answer: b |
| 3. The pathway of the movement of water through cell wall is called as __________
a) Symplastic pathway b) Apoplastic pathway c) Vacuolar pathway d) Plasmodesmata pathway Answer: b |
| 4. The value of osmotic pressure depends on _________________
a) Concentration of solute b) Concentration of solvent c) Concentration of solution d) All of the above. Answer: a |
| 5. In older dying leaves to younger leaves the minerals are carried as ____
a) Inorganic compound b) Organic compound c) Ionic forms d) All of the above. Answer: b |
| 6. When a cell is placed in 0.50 M concentrated sugar solution, there is no change in it. So the external solution is called _______________
a) Hypertonic b) Hypotonic c) Isotonic d) Colloidal Answer: c |
| 7. In a hypertonic solution a cell’s water potential _______
a) Decreases b) Increases c) First increases then decreases d) No change Answer: a |
| 8. Which one of the following will not directly affect transpiration?
a) Temperature b) Light c) Wind speed d) Chlorophyll content in leaves Answer: d |
| 9. Two cells are contiguous. Cell a has osmotic pressure 10atm., 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 b) Equilibrium between the two c) Movement of water from cell A to B d) Movement of water from cell B to A Answer: d |
| 10. A cell devoid of cell wall will burst if immersed in
a) Hypertonic solution b) Hypotonic solution c) Isotonic solution d) All of the above. Answer:b |
| 11. Absorption of water by roots is increased when
a) Transpiration is increased b) Transpiration is decreased c) Photosynthesis is increased d) Photosynthesis is increased Answer: a |
| 12. “Osmosis is the diffusion of a solution of a weaker concentration into a solution of a higher concentration when both are separated by a semi permeable membrane”. What is the error in this statement?
a) The exact concentration is not indicated b) There is no mention of DPD c) The movement of water molecule is not specified d) The behaviour of semi permeable membrane is not specified Answer: c |
| 13. When a cell is fully turgid which of the following will be zero?
a) Turgor pressure b) Wall pressure c) Osmotic pressure d) DPD Answer: d |
| 14. Which of the following changes in the cell sap of the guard cells is responsible for keeping the stomata open during day time?
a) Increase in osmotic pressure but decrease in turgor pressure b) Decrease in osmotic pressure but increase in turgor pressure c) Increase in both osmotic pressure and turgor pressure d) Decrease in both osmotic pressure and turgor pressure Answer: b |
| 15. Root pressure is maximum when
a) Transpiration is high and absorption is very low b) Transpiration is very low and absorption is high c) Both transpiration and photosynthesis is very high d) Both transpiration and photosynthesis is low Answer: b |
| 16. Which of the following growth hormone is associated with stomatal movements?
a) Auxin b) Gibberellins c) Abscissic acid d) Cytokinins Answer: c |
| 17. A field is generally watered in sufficient amounts water after the application of fertilizers to prevent ___________
a) Plasmolysis b) Deplasmolysis c) Osmosis d) Diffusion Answer: a |
| 18. Which one of the following is not a characteristic of active transport?
a) Highly selective b) Transport solutes c) Uphill transport d) Insensitive to inhibitors Answer: d |
| 19. Path of water movement from soil to xylem is
a) Soil – root hair- cortex-pericycle- endodermis- metaxylem-protoxylem b) Soil – root hair-cortex-endodermis-pericycle- protoxylem-metaxylem c) Soil- root hair-epidermis-phloem-xylem d) Soil- root hair- epidermis-cortex-xylem- phloem Answer: b
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| 20. Stomatal opening is under the control of _____________
a) Epidermal cells b) Subsidiary cells c) Guard cells d) Mesophyll cells. Answer: c |
| 21. Ascent of sap is __________
a) Upward movement of organic matter in plants b) Downward movement of organic matter in plants c) Downward movement of water in plants d) Upward movement of water in plants Answer: d |
| 22. Hydathodes are associated with _________
a) Guttation b) Transpiration c) Respiration d) Transportation Answer: a |
| 23. The process of guttation takes place when _________
a) The root pressure is high and the rate of transpiration is low b) The root pressure is low and the rate of transpiration is high c) The root pressure equals the rate of transpiration d) The root pressure as well as the rate of transpiration is high Answer: a |
| 24. The element involved in the opening and closing of stomata is
a) Chlorine b) Sodium c) Potassium d) Calcium Answer: c |
| 25. Phloem sap is mainly made of ____________
a) Water and sucrose b) Water and glucose c) Water and starch d) Water and fructose Answer: a |
| 26. The following type of guard cells are found in ______________
a) Dicots b) Monocots c) Gymnosperms d) Ferns Answer: b |
| 27. Which one of the following is a driving force for the process of passive absorption of water in roots?
a) Activity of aquaporins b) Increase in imbibition pressure in root cells c) Root pressure d) Transpiration pull Answer: d |
| 28. Which elements are readily mobilized in plants?
a) S,N,Mo b) S,N,P c) S,N,B d) S,Mn,Mo Answer: b |
| 29. Stomatal frequency indicates ______________
a) Rate of gaseous exchange b) Rate of water loss c) Number of stomatal aperture d) Number of stomata per unit area. Answer: d |
| 30. The ability of water to resist a pulling force is known as _________
a) Tensile strength b) Surface tension c) Cohesion d) Capillarity Answer: a |
| 31. In dorsiventral leaf, the number of stomata per unit area are generally
a) Same on both surfaces b) More on lower surface c) More on upper surface d) Absent in upper surface Answer: b |
| 32. In an isobilateral leaf the number of stomata per unit area is
a) More on lower surface b) More on upper surface c) Same on both surfaces d) Absent in upper surface Answer: c |
| 33. Water in plants is transported by or ascent of sap takes place through
a) Root pressure b) Transpiration pull c) Diffusion pressure deficit d) Turgor pressure Answer: c |
| 34. Which ones do not show transpiration?
a) Aquatic plants with floating leaves b) Aquatic submerged plants c) Plants growing in hilly areas d) Plants living in deserts Answer: b |
| 35. Which of the following statements is not true?
a) The Apoplastic movement of water occurs exclusively through the cell wall without crossing any membrane b) Solute present in any cell increase the free energy of water or water potential c) The symplastic pathway occurs from cell to cell through plasmodesmata d) Membrane permeability depends on the membrane composition as well as the chemical nature of the solute. Answer: b |
| 36. Which one of the following these 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 time d) Guttation is of universal occurrence Answer: d |
| 37. Which of the following is not purpose of transpiration?
a) Supplies water for photosynthesis b) Maintains shape and structure of plants. c) Helps in translocation of sugar from source to sink d) Transports minerals from the soil to all parts of plants. Answer: c |
| 38. Cobalt chloride is blue in dry state .In contact with moisture it turns into
a) Red b) Orange c) Pink d) Purple Answer: c |
| 39. If a cell gets reduced in size when placed in a solution, the solution is
a) Isotonic b) Hypotonic c) Hypertonic d) Heterotonic Answer: c |
| 40. A cell placed in strong salt solution will shrink because
a) Cytoplasm will disintegrate b) Cell wall gets broken due to mineral salts c) Salt water enters the cell d) Water comes out by Exosmosis Answer: d |
| 41. Wilting in plants occurs when
a) Phloem is blocked b) Xylem is blocked c) Cortical cells are blocked d) Pith is removed Answer: b |