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Botany Stems
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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 stemĀ
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
ID
315817
Card Set
Botany Stems
Description
adaf
Updated
2016-02-12T04:12:32Z
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