Biology 23.1
-
Upload
tamara -
Category
Technology
-
view
731 -
download
0
Transcript of Biology 23.1
23-1 Specialized Tissues in Plants
Chapter 23: Roots, Stems, and Leaves
Epidermal Cell
• Cell that makes up the dermal tissue, which is the outer covering of a plant
Vessel Element
• In angiosperms, xylem cell that forms part of a continuous tube through which water can move
Sieve Tube Element
• Phloem cell that is joined end-to-end to similar cells to form sieve tube
Companion Cell
• Phloem cell that surrounds sieve tube elements
Parenchyma
• Type of ground-tissue cell with a thin cell wall and large central vacuole
Collenchyma
• Type of ground tissue cell with a strong, flexible cell wall; helps support larger plants
Sclerenchyma
• Type of ground-tissue cell with an extremely thick, rigid cell wall that makes ground tissue tough and strong
Meristem
• Cluster of tissue that is responsible for continuing growth throughout a plant’s lifetime
Meristematic Tissue
• Tissue that controls the internal movement of materials in the body, as well as external movement
Apical Meristem
• The group of undifferentiated cells that divide to produce increased length of stems and roots
Differentiation
• The process in which cells become specialized in structure and function
• Three of the principal organs of seed plants are roots, stems, and leaves
• Plants consist of three main tissue systems: dermal tissue, vascular tissue, and ground tissue
• Vascular tissue contains several types of specialized cells. Xylem consists of tracheidsand vessel elements. Phloem consists of sieve tube elements and companion cells.
• Meristematic tissue is the only plant tissue that produces new cells by mitosis.