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Term Meristems Apical meristems Vascular cambium Cork cambium Intercalary meristems Parenchyma Chlorenchyma Collenchyma Sclerenchyma Xylem Phloem Epidermis Cuticle Stomata Guard cells Periderm Definition Tissues in which cells actively divide Found at or near the tips of roots and shoots A narrow cylindrical sheath of cells that produces secondary xylem and phloem in stems and roots Forms a thin cylinder that runs the length of roots and stems in woody plants Develop at intervals along stems adding to stem length in plants that have no cambium Tissue composed of parenchyma cells which are the most common type of plant cell Parenchyma cells containing numerous choloroplasts, function mainly in photosynthesis Have thick uneven cell walls and provide flexible support for both growing organs and mature organs Tissue consisting of cells that have thick , tough secondary walls, dead at maturity Conducts water and dissolved minerals throughout all organs Conducts dissolved food materials throughout the plant The outermost layer of cells of all young plant organs A waxy protective layer on the outer walls of epidermal cells Small pores in the epidermis of leaves A pair of specialized cells surrounding a stoma Replaces the epidermis in woody plants, the outer bark