Cell types
Parenchyma
Collenchyma
Sclerenchyma
Parenchyma
Living
Thin, cellulose walls
Least specialized
Most common
Collenchyma
Unevenly thickened
Pectin walls
Support
Least common
(Stems of herbaceous plants)
Sclerenchyma
Dead
Thick, lignin walls
Support in primary and secondary tissues
Tissue types
Epidermal- skin
Vascular- xylem and phloem
Ground- everything else
Xylem
Water and minerals
Phloem
Carbohydrates
Trachids
Dead Narrow, long Closed at ends Pits in secondary wall Ferns and gymnosperms
Vessel Members
Dead Hollow and short Perforation plates Pits Stacked Angiosperms
Meristem
Where cells divide in plants
Apical- primary (non woody)
Lateral- (cork and vascular) secondary (woody)
Nodes
Leaf attachment sites
Stomata
Formed by 2 guard cells
CO2, water vapor, and oxygen into leaf