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Botany the study of plants Perennial plants plants that grow year after year Annual plants plants that live for only one year Biennial plants plants that live for two years Vegetative organs the parts of a plant(such as stems, roots, and leaves) that are not involved in reproduction Reproductive plant organs the parts of a plant(such as flowers, fruits, and seeds) involved in reproduction Undifferentiated cells cells that have no specialized in any particular function Xylem nonliving vascular tissue that carries water and dissolved minerals from the roots of a plant to its leaves Phloem living vascular tissue that carries sugar and organic substances throughout a plant Leaf mosaic the arrangement of leaves on the stem of a plant Leaf margin the characteristics of the leaf edge Deciduous plant a plant that loses its leaves for winter Girdling the process of cutting away a ring of inner and outer bark all the way around a tree trunk Alteration of generations a life cycle in which there is both a multicellular diploid form and a multicellular haploid form Dominant generation in alternation of generations, the generation that occupies the largest portion of the life cycle Pollen a fine dust that contains the sperm of seed-producing plants Cotyledon a "seed" leaf which develops as a part of the seed