TAILIEUCHUNG - Lecture AP Biology - Chapter 36: Resource acquisition and transport in vascular plants

After studying this chapter you will be able to understand: The role of passive transport, active transport, and cotransport in plant transport; the role of diffusion, active transport, and bulk flow in the movement of water and nutrients in plants; how the transpiration cohesion-tension mechanism explain water movement in plants; how pressure flow explains translocation. | Ch. 36 Warm-Up Describe the process of how H2O gets into the plant and up to the leaves. Compare and contrast apoplastic flow to symplastic flow. Explain the mass flow of materials in the phloem (source to sink). Ch. 36 Warm-Up What is transpiration? What are mycorrhizae? What is the function of the Casparian strip? Chapter 36 Resource Acquisition and Transport in Vascular Plants What you need to know: The role of passive transport, active transport, and cotransport in plant transport. The role of diffusion, active transport, and bulk flow in the movement of water and nutrients in plants. How the transpiration cohesion-tension mechanism explain water movement in plants. How pressure flow explains translocation. What does a plant need? Review: Selectively permeable membrane: osmosis, transport proteins, selective channels Proton pump: active transport; uses E to pump H+ out of cell proton gradient Cotransport: couple H+ diffusion with sucrose transport Aquaporin: transport protein which controls H2O uptake/loss Solute transport across plant cell plasma membranes Osmosis **Water potential (ψ): H2O moves from high ψ low ψ potential, solute conc. & pressure Water potential equation: ψ = ψS + ψP Solute potential (ψS) – osmotic potential Pressure potential (ψP) – physical pressure on solution Pure water: ψS = 0 Mpa Ψ is always negative! Turgor pressure = force on cell wall Bulk flow: move H2O in plant from regions of high low pressure ** Review AP Bio Investigation 4 Flaccid: limp (wilting) Plasmolyze: shrink, pull away from cell wall (kills most plant cells) due to H2O loss Turgid: firm (healthy plant) Turgid Plant Cell Plasmolysis A watered impatiens plant regains its turgor. Vascular Tissues: conduct molecules Xylem Phloem Nonliving functional Living functional Xylem sap = H2O & minerals Phloem sap = sucrose, minerals, amino acids, hormones Source to sink (sugar made) to (sugar consumed/stored) Transport of H2O and minerals into xylem: Root epidermis cortex

• Sinh học
• Resource acquisition
• Transport in vascular plants
• Lecture AP Biology
• Systems biology
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• Word Alignment
• Cross Lingual Resource Acquisition
• Carol Nichols and Rebecca Hwa
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• Green Human Resource Management
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• Báo cáo lâm nghiệp hay
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• công trình nghiên cứu lâm nghiệp
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• Lecture Biology
• Vascular plants
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• ecosystem structure
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• resoure allocation
• Biological systems
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