biology chapter 29

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biology chapter 29
2011-05-26 18:05:28

biology 29
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  1. Dermal tissue (epidermis)
    • Function is protection
    • Cuticle ( waxy coat) prevents water loss
    • Stomata: regulates gas exchange
  2. Ground tissue
    • Fills in between dermal an vascular tissue
    • Metabolic function( photosyntheses and cellular respiration)
    • Storage (ex. Carrots)
    • Provides support in yhe center of roots and stems
  3. Xylem
    • Transports h2o and minerals upward
    • Provides structural support
    • Dead at maturity
  4. Tracheid
    • Long tapered
    • Walls have pits
  5. Vessel elements
    • Wider shorter
    • End walls perforated or gone completely
    • H2o moves easier
  6. Phloem
    Cells called sieve tube membersTransport foodAlive at maturityEnd walls ( sieve plates)
  7. Companion cell
    Along side each sieve tube memberProvides nucleus and ribosomes
  8. Meristem:
    Region of activly dividing cells
  9. Apical meristem
    • tips of roots and buds of stems
    • Primary growth= elongation
  10. Lateral meristems
    Cylinder of cells in woody plantsSecondary growth= thickness
  11. Vascular cambium
    Between the xylem and phloemMakes more vascular tissue
  12. Cork cambium
    Outside phloemMakes cork ( replaces epidermis)
  13. taproot
  14. fibrous root system
    grasses and many other monocots
  15. adevntitous root
    prop root of corn
  16. aerial roots
    get H2O from air
  17. root cap
    • Protection
    • Pollysachride slime
  18. root hairs
    • Increase surface area
    • Increase h2o absorption
  19. root functions
    • Anchor the plant
    • Absorb h2o and dilutes
    • Storage
    • - carbs (starch)- carrots turnips
  20. nodes
    point where one or more leaves are attached
  21. bud (meristematic)
    makes a new shoot- bud scales cover, later buds(sides), terminal bud(tip)
  22. stolon
    above ground, horizontal
  23. rhizomes
    • underground, horizontal
    • - sometimes have tubers at the end (potatoes)
  24. bulbs
    vertical underground shoots
  25. vascular bundles
    • - primary xylem inside...primary phloem outside
    • Monocots: scattered
    • Dicots: ring
  26. secondary growth in stems (girth)
    • Rare in monocotsCommon in dicots
    • Cells between primary xylem and primary phloem become vascular cambium
  27. bark
    PhloemCork cambiumCork- prevents infection and water loss
  28. translocation
    • Transport food
    • Carried by sieve tube members (phloem)
    • Source to sink transport
  29. source
    organ of sugar production
  30. sink
    organ that consumes or stages the sugar
  31. mesophyll =ground tissue
    - palisade- upper- ps- spongy- lower- ps and has exchange