lamina (lam'uh-nuh) see blade lateral bud (lat'uh-rul bud) see axil laticifer (luh-tis'uh-fur) specialized cells or ducts resembling vessels; they form branched networks of latex-secreting cells in the phloem and other parts of plants (p. 97) leaf (leef) a flattened, usually photosynthetic structure arranged in various ways on a stem (p. 110) leaf gap (leef gap) a parenchyma-filled interruption in a stem's cylinder of vascular tissue immediately above the point at which a branch of vascular tissue (leaf trace) leading to a leaf occurs (p. 90) leaflet (leef'lit) one of the subdivisions of a compound leaf (p. 110) leaf scar (leef skahr) the suberin-covered scar left on a twig when a leaf separates from it through abscission (p. 88) leaf trace (leef trays) see leaf gap legume (leg'yoom) a dry fruit that splits along two "seams," the seeds being attached along the edges (p. 138) lenticel (lent'uh-sel) one of usually numerous, slightly raised, somewhat spongy groups of cells in the bark of woody plants; lenticels permit gas exchange between the interior of a plant and the external atmosphere (p. 62, 90) leucoplast (loo'kuh-plast) a colorless plas-tid commonly associated with starch accumulation (p. 41) light-dependent reactions (lyt-dee-pen-dent ree-ak'shunz) a series of chemical and physical reactions through which light energy is converted to chemical energy with the aid of chlorophyll molecules; in the process, water molecules are split, with hydrogen ions and electrons being produced and oxygen gas being released; ATP and NADPH also are created (p. 176) light-independent reactions (lyt in-dee-pen-dent ree-ak'shunz) a cyclical series of chemical reactions that utilizes carbon dioxide and energy generated during the light-dependent reactions of photosynthesis, producing sugars, some of which are stored as insoluble carbohydrates, while others are recycled; the reactions are independent of light and occur in the stroma of chloroplasts (p. 176) lignin (lig'nin) a polymer with which certain cell walls (e.g., those of wood) become impregnated (p. 55) ligule (lig'yool) the tiny tongue-like appendage at the base of a spike moss (Selagi-nella) or quillwort (Isoetes) leaf (p. 401) linked genes (linked jeens) genes located on the same chromosome (p. 245, 248) lipid (lip'id) a general term for fats, fatty substances, and oils (p. 22) locule (lok'yool) a cavity within an ovary or a sporangium (p. 140) locus (loh'kuss) the position of a gene on a chromosome (p. 242, 249) long-day plant (long-day plant) a plant in which flowering is not initiated unless exposure to more than a critical day length occurs (p. 214)

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