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Vascular Tissue System
Transcript of Vascular Tissue System
Hour 2 The Vascular Tissue System is a continuous system of tissues that conduct water, minerals, and food. It consists of two complex tissues; xylem and phloem. Xylem: bring water and mineral nutrients from the roots to the rest of the plant
Tracheids: long cells with tapered ends. First water-conducting cells to evolve in vascular plants. Found mainly in ferns, conifers, and most other nonflowering vascular plants.
Pits: Secondary cell wall of tracheids. Only primary wall is present. Allow water and minerals to flow from one tracheid to another. Most flowering plants and a few gymnosperms contain water conducting cells called Vessel Elements which transport water and minerals more rapidly than tracheids. Phloem: moves sugars and other organic nutrients from the leaves to the rest of the plant.
Sieve tube members: remain alive and active at maturity unlike tracheids and vessel elements.
Sieve plate: cell walls with membrane-lined pores that allow materials to pass form cell to cell without crossing the plasma membranes and cell walls.
Companion cell: has a nucleus and can therefore supply proteins for the sieve-tube member. Sieve cell: more primitive type of water-conducting cell. Function much like sieve-tube members, by lack sieve plates and overlap rather than forming continuous tubes.
Albuminous cell: a cell that helps the sieve cell function by providing proteins for it. Bibliography
Slides 1-6, Introduction to Botany by Murray W. Nabors