1. Stem Parts

2. External Parts Terminal bud: bud on end of stem
Axillary or lateral bud: bud on side of stem
Lateral bud
Terminal bud

3. External Parts Lenticels: breathing pores

4. External Parts
Bud scale scars: show where the terminal buds have been located

5. External Parts Leaf scars: show where leaves were attached

6. Internal Parts
Xylem: tissue that transports water and nutrients up from roots to stems and leaves

7. Internal Parts
Phloem: tissue that transports food down from leaves to roots

8. Internal Parts Cambium:
thin, green, actively growing tissue located between the xylem and phloem
produces all new stem cells

9. Internal Parts Vascular bundles: Part of the transport system
Contains xylem and phloem

10. Internal Parts Bark: old inactive phloem Heartwood: old inactive xylem
Sapwood: new active xylem

11. Classes of Plants Monocots Dicots

12. Monocots
Plant stems have vascular bundles that contain both xylem and phloem in each bundle
Examples: corn, grasses

13. Dicots
Plant stems have phloem layer and xylem layer separated by cambium
Example: Tree

14. Monocots vs. Dicots

15. Monocots vs. Dicots

16. Functions of the Stem Translocation:
Move water and minerals from roots up to the leaves.
Move food from the leaves down to the roots.
Support of the braches, leaves, flowers, fruit, and/or seeds.