LS1 Lecture 5: Plant systems and structures

  1. cell wall
    • made of cellulose, provides structural support to cells
    • provides mechanical support that allows plants to stand erect
  2. basic plant organs
    • roots
    • stems
    • leaves
  3. 2 systems of plants
    • shoot system
    • root system

    Image Upload 1
  4. functions of roots
    • (organ of root system)
    • absorb water and nutrients
    • anchor it to the soil
    • storage
  5. monocot root
    fibrous roots that gather surface water (top of the soil), gathers water when there is rain
  6. eudicot root
    tap root will grow and goes deep to find stored water regardless of rain fall
  7. Lateral roots are __ in structure. Root hairs are __ in structure.
    multicellular; unicellular
  8. Lateral roots
    • epidermis: absorption of nutrients
    • Vascular tissue allows water to move long distances. Vascular tissue is bundled in the center (stele)
  9. plasmodesmata
    • intercellular channels that are lined by extensions of the cell membrane. Tubules running through these channels connect the endomembrane systems of the 2 cells
    • Like gap junctions, they permit signaling molecules to pass between cells in such a way that they can be targeted to only one or a few adjacent cells
  10. wax between stele and ground tissue
    casparian strip
  11. goes down at an angle to prop up the plant (keeps the plant upright)
    prop root
  12. Sweet potato is a type of __
  13. root system in the air, parasitic
    aerial roots
  14. traps water and nutrients
    buttress roots
  15. roots for gas exchange, live in wetlands. Roots go up out of the water to get oxygen
  16. Leaves attach to the stem at the __

    - Internodes are the spaces between the nodes
  17. At every node, there is a __ marking the junction of the node.
    axillary bud
  18. produces hormones that inhibit growth of the axillary bud. Removing it will allow the axillary buds to grow.
    terminal bud
  19. types of modified stems
    • stolons
    • bulbs
    • tubers
    • rhizomes
  20. horizontal stems that grow along the surface, allows asexual reproduction at the nodes
    stolons. ex. stems of strawberries
  21. vertical shoots underneath the ground with modified leaves that store nutrients
  22. enlarged ends of rhizomes specialized for storing food
    tubers (potatoes)

    Potatoes and sweet potato are analogous.
  23. horizontal stems below the surface

    (swollen stolons)
  24. The part of the leaf that comes off the stem is  the __
  25. leaf morphology
    Image Upload 2
  26. types of modified leaves
    • tendrils: can be used to hold on to a substrate
    • spines (for protection. Cacti uses stems for storage)
    • succulent leaves (storage)
    • bracts (colored leaves that surround flowers and attract pollinators)
    • adventitious (used for asexual reproduction)
  27. monocot vs eudicot leaves
    • Image Upload 3
    • monocot (left): parallel
    • eudicot (right): netlike
Card Set
LS1 Lecture 5: Plant systems and structures
Ch. 28, 29, 30