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Tissues and the primary growth of stems (Internal Organization of Stems:…
Tissues and the primary growth of stems
Basic Types of Cells and tissues
Parenchyma
Primary walls & thin
Most common
Soft parts
Collenchyma
Unevenly thickened
Provide plasticity
Sclerenchyma
Primary + Secondary walls
Some water transport
Some plastic support
Most dead @ maturity ☠️
External Organization of Stems
Nodes
Where leaves attach 🌱
Internodes
Between nodes
Phyllotaxy
Arrangement of leaves on stem
PYLLOTAXY
Internal Organization of Stems: Arrangement of Primary Tissues
Epidermis
Single layer
Parenchyma Cells
Waxes=waterproofing
Cortex
Simple
Inside epidermis
Vascular Tissues
Needed when diffusion isn't enough
Xylem
Don't have to be alive
Phloem
Remain alive
Vascular Bundles
Xylem + Phloem
Stem Growth and Differentiation
Mitosis in meristems
Visible differentiation in subapical
APICAL MERISTEM
