Stem Parts

External Parts Terminal bud: bud on end of stem Axillary or lateral bud: bud on side of stem Lateral bud Terminal bud http://www.macphailwoods.org/shrub/altdog.html

External Parts Lenticels: breathing pores http://cikgurozaini.blogspot.com/

External Parts Bud scale scars: show where the terminal buds have been located http://www.austintreeexperts.com/blog/tree-selection-how-to-pick-a-tree/

External Parts Leaf scars: show where leaves were attached http://freelearners.wordpress.com/2010/03/ http://www.extension.org/pages/32082/leaf-scar

Internal Parts Xylem: tissue that transports water and nutrients up from roots to stems and leaves http://images.yourdictionary.com/xylem

Internal Parts Phloem: tissue that transports food down from leaves to roots http://images.yourdictionary.com/xylem

Internal Parts Cambium: thin, green, actively growing tissue located between the xylem and phloem produces all new stem cells http://images.yourdictionary.com/xylem

Internal Parts Vascular bundles: Part of the transport system Contains xylem and phloem http://botit.botany.wisc.edu/Resources/Botany/Shoot/Stem/Zea%20stem/Vascular%20bundle%20zea.jpg.html

Internal Parts Bark: old inactive phloem Heartwood: old inactive xylem Sapwood: new active xylem http://www.biologycorner.com/bio2/notes_plants_morph.html

Classes of Plants Monocots Dicots http://blog.landscapestlouis.com/featured/top-10-fall-plants-ornamental-grasses/ http://zeitgeistmovementpa.ning.com/notes/How_to_plant_a_Tree

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

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

Monocots vs. Dicots http://biology.unm.edu/ccouncil/Biology_203/Summaries/FloweringPlants.htm

Monocots vs. Dicots

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.