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Roots & stems moodle

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  • Stems allow water and minerals to move from the roots to the leaves and food (glucose) to go from the leaves to the roots . Hold up the leaves which undergo photosynthesis (requiring water and producing glucose).

Transcript

  • 1. Roots & Stems Notes
  • 2. Cross Section of Roots• Epidermis – Protects against water loss – Outer covering• Cortex – Storage of photosynthetic products – Active in the uptake of water and minerals• Pith – Centermost region of the root
  • 3. Cross Section of Roots• Endodermis – Prevents water from getting into the middle of roots – Water can only enter through root hairs• Pericycle – Allow for lateral root growth – Outermost layer of the central vascular system
  • 4. Epidermis EndodermisPericycle
  • 5. Cross section of roots• Phloem – Carries food from the leaves to the stems and roots – Vascular Tissue• Xylem – Carries water and minerals from the root to the stems and leaves – Vascular Tissue
  • 6. Monocot Root
  • 7. Dicot Root
  • 8. Stems - Functions• Transportation System – Contains xylem and phloem• Support System – Holds up leaves and plant
  • 9. Cross Section of Stem1. Protective Tissues – Epidermis & Cork1. Vascular Tissues – Vascular Bundles • Includes xylem & phloem
  • 10. Cross Section of Stem3. Meristematic Tissues – Apical meristem (1° - increase height of plant) – Lateral meristem (2° - increase width of plant) – Vascular cambium • Produces more xylem towards the inside and more phloem towards the outside – Cork cambium • Produces more cork and cortex
  • 11. Cross Section of Stem4. Storage Tissues – Cortex (only found in dicot stems) – Pith (found in both dicot & monocot stems)
  • 12. Epidermis Pith PhloemXylem Vascular bundle
  • 13. Herbaceous Monocot StemUsing the previous slide, label the following picture.
  • 14. Herbaceous Dicot StemUsing the previous slide, label the following picture.
  • 15. Herbacous Dicot Stem Cross Sections
  • 16. Do you see the difference? Herbaceous Stems