- Select the correct ones.
(i) Apoplastic movement of water occurs exclusively through
cell wall.
(ii) Solutes increase free energy of water or water potential.
(iii) Symplastic movement occurs through plasmodesmata.
(iv) Membrane permeability depends upon membrane
composition as well as chemical nature of solute.
(a) (i) and (ii) only (b) (ii) and (iv) only
(c) (i), (iii) and (iv) only (d) (i), (ii) and (iv) only - Guttation occurs when
(a) wind velocity is high and low water available in soil
(b) humidity increases in environment and no available water in
soil
(c) root pressure is less and transpiration rate is more
(d) root pressure is more and transpiration rate is less. - Downward movement of organic and inorganic solutes from
leaves occurs through
(a) phloem by diffusion
(b) phloem by protoplasmic streaming
(c) parenchymatous cells by diffusion
(d) phloem by mass flow. - The loss of which will harm the tree most?
(a) Bark (b) Half the leaves
(c) Half the branches (d) All the leaves - For the same amount of CO 2 fixed, a C 4 plant as compared to
C 3 plant loses only
(a) half the amount of water (b) double amount of water
(c) equal amount of water (d) none of these. - Rate of transpiration is high in
(a) wheat (b) maize (c) Opuntia (d) Sorghum. - When half the leaves are removed randomly, transpiration will
show
(a) higher magnitude but lower flux or rate per unit
(b) lower magnitude but higher flux
(c) both magnitude and flux increase
(d) both magnitude and flux decrease. - An antitranspirant is
(a) cobalt chloride (b) mercury
(c) potassium (d) aspirin. - Transpiration increases in
(a) hot, damp and windy conditions
(b) cool, damp and windy conditions
(c) cool, dry and still conditions
(d) hot, dry and windy conditions. - Passive absorption of water occurs due to
(a) hydrostatic pressure in root
(b) tension in xylem sap
(c) ATP (d) none of these. - In order to demonstrate root pressure, the plant is given a cut at
(a) the tip
(b) transition zone
(c) a few centimeters above the soil
(d) a few centimeters below the soil.
44. Arrange root hair cell, inner cortical cell and mesophyll cell in
descending order of <w.
(a) Mesophyll cell, root hair cell and cortical cell
(b) Cortical cell, mesophyll cell and root hair cell
(c) Root hair cell, cortical cell and mesophyll cell
(d) Root hair cell, mesophyll cell and cortical cell
45. In soil, the water available for root absorption is
(a) holard (b) chresard
(c) echard (d) combined water.
46. Which of the following is correct pathway of water movement
plants?
(a) Soil → Root hair → Cortex → Endodermis → Pericycle
→ Metaxylem → Protoxylem
(b) Soil → Root hair → Endodermis → Cortex → Pericycle
→ Metaxylem → Protoxylem
(c) Soil → Root hair → Cortex → Endodermis → Pericycle
→ Protoxylem → Metaxylem
(d) Soil → Root hair → Pericycle → Endodermis → Cortex
→ Protoxylem → Metaxylem
47. Plant cells dipped in distilled water will become
(a) turgid (b) plasmolysed
(c) flaccid (d) impermeable.
48. Which of the following is false regarding facilitated diffusion?
(a) Show transport saturation
(b) Uphill transport
(c) Effected by protein poisons
(d) Passive process
49. Purple cabbage leaves do not loose anthocyanin in cold water
but do so in hot water because
(a) hot water enters the cells faster
(b) pigment is not soluble in cold water
(c) hot water destroys cell walls
(d) hot water kills plasma membrane and makes it permeable.
50. Osmosis involves movement of
(a) solute particles from higher concentration to lower
concentration
(b) solvent particles from lower water potential to higher
water potential
(c) solute particles from lower concentration to higher
concentration
(d) solvent particles from higher water potential to lower
water potential.- (b) 2. (c) 3. (d) 4. (a) 5. (d)
- (a) 7. (c) 8. (c) 9. (b) 10. (c)
- (c) 12. (c) 13. (c) 14. (b) 15. (b)
- (b) 17. (b) 18. (b) 19. (d) 20. (a)
- (d) 22. (b) 23. (b) 24. (c) 25. (b)
- (a) 27. (d) 28. (b) 29. (d) 30. (b)
- (b) 32. (b) 33. (c) 34. (d) 35. (d)
- (a) 37. (a) 38. (a) 39. (b) 40. (d)
- (d) 42. (b) 43. (c) 44. (c) 45. (b)
- (c) 47. (a) 48. (b) 49. (d) 50. (d)
ANSWER KEY