• Document: STRUCTURAL ORGANIZATION OF VASCULAR PLANTS
  • Size: 6.39 MB
  • Uploaded: 2019-05-17 18:07:23
  • Status: Successfully converted


Some snippets from your converted document:

STRUCTURAL ORGANIZATION OF VASCULAR PLANTS STRUCTURAL ORGANIZATION OF VASCULAR PLANTS  The vascular plant body plan  Root system  Shoot system  Stems  Leaves  Flowers 2 PLANT TISSUES  Tissue = collection of similar cells that perform a common specialized function  Ground tissue  Bulk of the plant body  Vascular tissue  Conduct water (xylem) and nutrients (phloem)  Dermal tissue  Cover plant outer surfaces 3 Meristems  “Stem cells” that give rise to other plant tissues and direct plant growth  Apical meristems  Lateral meristems 4 Apical Meristems  Tips of shoots and roots  Growth in length & height (primary growth)  Give rise to other tissue layers  Ground, vascular, dermal 5 Tissue Development  Development of meristems  Ground meristem  Ground tissue  Procambium  Vascular tissue  Protoderm  Epidermis 6 Lateral Meristems  Periphery of shoots and roots  Growth in width (secondary growth)  Woody plants…  Vascular cambium  Produces secondary vascular tissue  Cork cambium  Produces bark 7 Ground Tissue  Tissues forming bulk of plant body  Simple tissues  1 type of cell  3 categories of ground tissue 8 Ground Tissue  Parenchyma  Soft moist tissues  Roots, stems, leaves, flowers, fruits  Function  Photosynthesis, food storage, water storage 9 Ground Tissue  Collenchyma  Function  Flexible support  Elongated cells layered with pectin  Holds cellulose fibers  Maintains pliability 10 Ground Tissue  Sclerenchyma  Function  Strength, protection, support  Lines water conducting cells  Thick cell walls fortified with lignin  Fibers or sclereids  Fibers support vascular system  E.g., woven rope (Agave)  Sclereids: e.g., peach stones, pear grit, coconut shell 11 Vascular Tissue  Conducting tissues  Xylem  Transport of water & dissolved minerals  Phloem  Transport of sugars and other solutes 12 Xylem  Transports water & dissolved minerals  Form continuous “pipelines” from roots to leaves  H2O diffuses through pores in walls  Mature cells die: provide support  2 types of elements  Tracheids  Tapered / overlap  Vessel members  End-end 13 Phloem  Transport of sugars and other solutes  2 types of elements  Sieve tube members  Sieve plate  Pores (large) between cells  Companion cells  Assist in sugar loading  Sieve cells  No companion cells  Gymnosperms & seedless 14 vascular plants Dermal Tissue  Epidermis  Provides protective outer covering over plant surfaces  Specialized structures  Cuticle  Waxy outer covering  Stomata  Pores (stoma)  Trichomes  Root hairs  Replaced with secondary growth (bark) in woody 15 plants Dermal Tissue  Carniverous plants 16 SHOOT SYSTEM  Stems  Dicots  Vascular bundles  Arranged in ring  Large 17 Dicot Stem 18 Vascular Bundle 19 Shoot System  Stems  Dicots  Monocots  Vascular bundles  Distributed throughout

Recently converted files (publicly available):