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71. What is the mode of absorption by epiphytic roots ?

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The two forces which are responsible for the upward movement of water in a plant are :

(i) Root pressure.

(ii) Transpiration pull.

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73. The highest osmotic pressure is recorded in.

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74. In what way does the concept of water potential help in explaining water movement ?

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75. Loss of water decreases or increases Ψ_w? Comment.

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76. Is there a general mechanism to explain opening and closing of stomata? Justify your answer.

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77. One way in which osmotic pressure is different from the osmotic potential.

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78. Which force helps in the absorption of water ?

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79.

What cause the opening and closing of guard cells of stomata during transpiration ?

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80. Name the state of the cell when the water flow in and out of the cell is in equilibrium.

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