PBIO 1210 Lecture Notes - Lecture 9: Medicago, Phloem, Sieve Tube Element

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Explain how water moves through plants using the concepts of cohesion and tension. Explain how sugar moves through plants using the concepts of source/sink and di usion. Water enters plants through the roots and moves through stems to leaves. Water is transported through a specialized tissue called xylem. Tissues = groups of one or several types of cells: dermal (skin or epidermis) tissue, vascular tissue. Xylem supports the plant and conducts water. Phloem transports sugars and other organic compounds in watery solution. These conducting tissues are located near each other within elongate vascular bundles: within a plant, the vascular bundles are interconnected, forming an extensive network extending throughout the roots, stems, leaves, and systems. Alfalfa is a perennial owering plant in the pea family fabaceae cultivated as an important forage crop in the u. s. , canada, argentina, france, australia, the middle. Xylem specialized cells that, when mature, provide a hollow tube for the ow of water, minerals, and certain organic compounds.

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