Cells and tissues

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  1. Primary cell wall
    • -Cellulose
    • -Wall structure
    • -Physical charactertics
    • -Middle lamella
    • -Pits/ Plasmodosmata
  2. Cellulose
    • Polymer of beta glucose
    • -Hydrpgens bond keep the molecule straight and together
    • -In cell wall, them are bundle of cellulose molecules.
    •    -40 molecule/bundle
    •      -microfibril
  3. Wall structure
    • Outside the protoplast
    • 1.) Cellulose microfibrils
    • 2.) Hemicellulose attached to microfibirls- link microfibrils together
    • 3.) Pectin- Get linked matrix filling in space.
  4. Physical characteristics
    (Cell Wall)- very flexible and will not stretch
  5. Middle Lamella
    glues adjacent cell wall together
  6. Pits/Plasmodosmata
    • Pits- hole thru cell wall (in clusters)
    • Plasmodosmata- tubular extension of plasma membrane
  7. Secondary Cell Wall
    • Construction
    • Component(link microfibrils, no pectin)
    • -Cellulose
    • -Hemicellulose
    • -Lignin: Phenyl propane alcohol (Monomer of lignin)
    •    -Not stretchable,stiff, elastic
  8. Tissue types
    • Primary tissue(ground tissue, Epidermal, Vascular)
    • Secondary tissue
  9. Ground Tissue
    • Paraenchyma
    • - primary cell wall (thin)
    • -Living
    • -Function: metabolic
    • Collenchyma
    • - primary cell wall varying thickness (thick and thin)
    • -Living
    • -Resident (flexible) support
    • Sclerenchyma
    • -primary and secondary cell wall (thick)
    • -Nonliving
    • -Support, water transport
    • -Shell (protection)
    • -Fibers: long, narrow
    • -Sclends: Short,Thick
  10. Epidermal
    • Oridinary epidermal cells
    • Guard cells
  11. Vascular
    • Xylem
    • a.)Tracheary element (primary and secondary cellwalls)
    •    - tracheids: no protoplasts, water through secondary cell wall pits and crosses primary cell wall.
    •    - vessel element: No primary cell wall in the Pits than tracheids (perforation and shorter and wider than tracheids)
    • b.) Fibers
    • C.) Collwnchyma
    • d.) Parachyme
    • Phloem
    • A.) sieve tube members
    • B.) companion cell
    • C.) Fiber
    • (A,B, and C is sugar condition)
    • D.) Collenchyma
    • E.) Parenchyma
  12. Functions of Secondary Growth
    Meristems: Embryonic tissue regions, primarily concerned with formation of new cells. (primary and secondary)

    procambium :A primary meristematic tissue that gives rise to primary vascular tissues.

    vascular cambium: A cylindrical sheath of meristematic cells that divides toproduce secondary phloem and secondary xylem.

    secondary growth: In plants, growth derived from secondary or lateralmeristems, the vascular cambium and cork cambium, that results in anincrease in girth; in contrast to primary growth, which results in an increase in length.

    periderm: Outer protective tissue thatreplaces epidermis when it is destroyed during secondary growth; includescork, cork cambium, and phelloderm.

    heartwood: Nonliving and commonly dark-colored wood in which no watertransport occurs; it is surrounded by sapwood.

    sapwood: Outer part of the wood of a stem or trunk, usually distinguished fromthe heartwood by its lighter color; part of woody stem in which conductionof water takes place
  13. Tree bark
Card Set
Cells and tissues
Vascular Plants
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