Plant Physiology

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Chapter 4 Study Questions

  1. Describe the path followed by water from the soil, through the plant and into the atmosphere. Where are the important resistances to water movement in this path?

    Textbook Reference: Chapter 4, pp. 99–117

  2. Describe the Casparian strip and its function. From the point of view of its function, what is the most important substance in the Casparian strip?

    Textbook Reference: Water Absorption by Roots, pp. 102–103

  3. Describe root pressure and explain under what conditions it might occur.

    Textbook Reference: Water Absorption by Roots, pp. 103–104

  4. How does the relative air humidity affect the transpiration rate of a leaf? If the air surrounding a transpiring leaf becomes warmer, how will this affect the transpiration rate of the leaf?

    Textbook Reference: Water Movement from the Leaf to the Atmosphere, pp. 110–112

  5. What is the driving force for the movement of water from the soil to the top of a tree and into the atmosphere?

    Textbook Reference: Water Movement from the Leaf to the Atmosphere, pp. 111–112

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