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23-5 Transport in Plants

23-5 Transport in Plants. p685. Q:What are the major forces that transport water in a plant?. A: The combination of transpiration and capillary action are the major forces that move through the xylem tissues of a plant. Transpiration-water loss through leaves (celery)

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23-5 Transport in Plants

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  1. 23-5 Transport in Plants p685

  2. Q:What are the major forces that transport water in a plant? • A: The combination of transpiration and capillary action are the major forces that move through the xylem tissues of a plant.

  3. Transpiration-water loss through leaves (celery) • Controlling Transpiration-guard cells • High transpiration rates lead to wilting(water loss)

  4. Water Transport • Capillary Action-water molecules rising in thin tube; cohesion(water to water) • Adhesion-attraction unlike molecules (water to the tube).

  5. Nutrient Transport • Q: What drives the movement of fluid through phloem tissues in a plant? • A: Changes in nutrient concentration drive the movement of fluid through phloem tissue in directions that meet the nutritional needs of the plant. • Functions of Phloem: pumping sugar into fruit from leaves.

  6. Movement from Source to Sink: pressure-flow hypothesis-pumping sugar to top part of the plant & then it sinks to the bottom with water.

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