Chapter 38 - Chapter 38 Transport in Plants I. Water and...

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Chapter 38 Transport in Plants I. Water and Mineral Movement 1. Water movement occurs through the xylem The unique structure of water allows it to stick to other water molecules (cohesion) /And cling to the sides of the xylem (adhesion) 2. Water potential regulates movement of water through a plant a. pressure potential = a physical pressure exerted by the cell wall on vacuole (turgor pressure) b. solute potential = osmotic potential, the potential created by differences in solute [ ] Water will enter a plant cell until it is stopped by turgor pressure, or until solute [ ] are equal on each side of the membrane Pure water has a water potential of zero Water movement is towards a more negative water potential 3. Transpiration – at the leaf surface creates a negative water potential 4. Water in the soil has a water potential around zero
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This difference in water potential due to transpiration creates water movement in plants I I. Water and Mineral Absorption A. Root hairs are the site of most absorption
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Chapter 38 - Chapter 38 Transport in Plants I. Water and...

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