Lesson 3: Plant Transport - Learning Objectives 1 Calculate the water potential of a cell and predict the direction of water movement based on water

Lesson 3: Plant Transport - Learning Objectives 1 Calculate...

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Learning Objectives: 1. Calculate the water potential of a cell and predict the direction of water movement based on water potential. 2. Compare the 3 water and mineral transport pathways through plant roots to the vascular tissue. 3. Explain the cohesion-tension theory of water transport in the xylem. 4. Describe the mechanism of stomatal opening and closing. 5. Explain the pressure flow hypothesis of fluid transport in the phloem. Abscisic acid- ABA, stimulates closing of stomata Adhesion- water sticks to walls of xylem Apoplastic route- Movement through cell wall and space between cells, Avoids membrane transport Aquaporins- Channel proteins selective of movement of water from one side of the membrane to another Casparian strip- regulates water movement from root cortex into xylem, Helps keeps parasites out, Plants have immune response Cavitation- interrupts forces, Air bubbles break tensile strength, May expand and block tracheid/vessel, Dangerous to plants, Find alternative pathways Cell wall-outside of plant cells, very hard and fibrous, prevents things from going in and out of the cell Central vacuole- an organelle used in storage of water that affects turgor Endodermis- an inner layer of cells in the cortex of a root and of some stems, surrounding a vascular bundle. Guard cells- cells that trigger opening and closing of stomata based on stimulation of malate Guttation- If root pressure increases water comes out of tips Megapascal- what water potential is measured in Mycorrhizae- fungi that have a symbiotic relationship with the plant that increases Sieve tube element- Sink- where transported elements and materials are deposited Source- where materials that are to be transported are gathered Solute Potential- solute concentration, as solute is added the value for potential becomes more negative, always below zero Stoma- singular of stomata Stomata- holes in leaves that aide in gas exchange Symplastic route-Utilizes plasmodesmata, Once inside can move between cells without crossing membrane Tension- the state of being stretched tight.
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