Botany Stems

Common functions of stems
- Support
- conduction
- storage of nutrients and water
- survival during harsh conditions
- production of new stems
Stem structure
- 1. axil
- 2. axillary bud
- 3. node
- 4. internode
bud
- undeveloped shoot containing immature apical meristem axillary bud occurs in leaf axil
- every leaf has an axillary bud
terminal bud
- occurs at tips of stem
- end of branch
Internal stem structure eudicot
- Epidermis
- vascular bundle
- cortex and pith
Monocot
- Epidermis
- vascular bundle
- parenchyma
secondary stems produce secondary tissues
ray

radial line of parenchyma connecting secondary xylem and secondary phloem
annual ring

amount of secondary xylem formed in one year
lenticels
- loose clusters of cells in outer bark; allow gas
- exchange between atmosphere & stem; required b/c live stem
- cells respire
gross structure of wood
- sapwood usually lighter color
- heartwood often darker
many plant species lack secondary meristem

Author

jo73

315817

Card Set

Botany Stems

Description

adaf

Updated

2016-02-12T04:12:32Z

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