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Test 2 Study Guide Lecture 7 Objectives ● Know what the suspensor is and what its function is o The suspensor delivers nutrients from the ovule to the embryo ● Know the parts of the angiosperm embryo (root and shoot apical meristems, hypocotyl, cotyledons, vascular tissue, ground tissue, epidermis) o o o o o Apical meristems- tips of all shoots and roots and are composed of cells that are capable of repeated division Cotyledon- seed leaf; generally absorbs food in monocotyledons and stores food in other angiosperms Hypocotyl- provides root shoot access 3 types of tissues that form in the embryo: ▪ Epidermis- outermost layer of cells of the lead and young stems and roots ▪ Vascular tissue- any plant tissue ● Xylem- most of the water and minerals of a plant are conducted; presence of 2 types of cells: tracheids- small, vessel elements- large. Water and mineral transport and support is driven by evaporation of water, tracheids and vessels dead at maturity, evapotranspiration powers water movement. Vessel elements are short and wide with open walls whereas tracheids are long and tapering with water movement through the pits on the sides o Tracheids- elongated and tapering with water movements through the pits on the sides, thick walled conducting and supporting cell of xylem (has tapering ends and pitted walls without perforation) o Vessel element- tube like structure with elongated cells connected through perforations. Function is to conduct water and minerals through the plant body ● Phloem- the food conducting tissue of vascular plants. Sugar and amino acid transport. 2 types of cells: sieve tube elements, companion cells.