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Tissues and The Primary Growth of Stems, LEAVES, Xylem and Phloem, xylem…
Tissues and The Primary Growth of Stems
Types of Cells and Tissues
Collenchyma
Unevenly thickened primary cells
Alive at maturity
Function: Plastic support
Sclerenchyma
Primary walls and secondary walls
Many dead at maturity
Function: Elastic support, Water transport
Two types
Conducting Sclerenchyma
Vessel elements
Tracheids
Mechanical sclerenchyma
Sclereids
Fibers
Parenchyma
Thin primary walls
Alive at maturirt
Function: Transport materials
Parenchyma tissue conducting nutrients over long distances- Phloem
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Organizations of Stems**
External Organizations
Phyllotaxy
Deccusate
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Whorled
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Opposite
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Spiral
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Distichous
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Alternate
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Internal Organizations
Epidermis
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Vascular Tissues
Cortex
Xylem
Phloem
Vascular Bundles
Stem Growth and Differentiation
LEAVES
One per node
Three or more per node
Located in four rows
Two per node
located in two rows
Not aligned with the nearest neighbours
Xylem and Phloem
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