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Tissues and Primary Growth of Stems (Internal Organizationtion of Stems…
Tissues and Primary Growth of Stems
BAsic Types of Cells and Tissues
Parenchyma cell
Thin primary walls
Typically alive at maturity
Soft leaves,petals, fruits and seeds are composed of parenchyma
Parenchyma tissue is ground tissue
Collenchyma cell
Provide plastic support, alive at maturity
Present in elongating shoot tips, plants like grapes
Unevenly thickened primary walls
Sclerenchyma Cell
Primary wall and secondary wall, provide elastic support
water transportation
Many dead at maturity
Two types
Sclereids
extremely variable in shape, present in various tissue of plants
provide gritty texture
Fibers
Long,elongated
Stem Growth and Differentiation
Apical meristem
Sub apical meristem
Internal Organizationtion of Stems
Vascular bundles
Xylem and Phloem occur together as vascular bundles
Vascular Tissues
Phloem
Sieve tube elements
Companion cells
Sieve cells
Xylem
Vessel elements
Tracheids
Dead
maturity
cortex
Epidermis
