PLANT TRANSPORT
WATER AND MINERALSXylem
The main water transporting tissue in the plant. Xylem is made up of different types of cells. Xylem vessels Specialized cells adapted to transport water. - elongated cells that become tubular - dead (wood!) and hollow cells - walls of lignin are thick and waterproof - narrow lumen tubes for capillarity - different patterns of lignin Water transport mechanisms
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VASCULAR TISSUESLeaves
Transporting tissue forms the veins of the leaf. Stems In Dicot plants, the vascular tissues are in bundles to the outside of the stem. Roots Young roots have a star shaped xylem, and phloem in between; all of which is in the center of the root. SPECIALIZED CELLS
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FOOD/ PHOTOSYNTHETIC PRODUCTSPhloem
Tubes that transport food from the leaves to the rest of the plant. Made up of different cell types. Phloem tubes or Sieve tube elements Main transporting tubes, hollow separated vertically from other cells via a sieve plate with many holes. Companion cell A cell latched on to the sieve tube element cells which carry out its main metabolic functions. Sugar sources - Loading Leaves are the sources, and phloems in leaves load sugars into the vascular bundles. Sugar sinks - Unloading Anywhere that cannot photosynthesize but needs glucose for energy. Sucrose has to leave the vascular bundle here via unloading . |