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Parenchyma Tissue Characteristics
Can de/redifferentiate
Living protoplast
Thin walled
Collenchyma Tissue Characteristics
Elongated w/ tapered ends
1* wall only
Pectin & cellulose
Living
Just below epidermis
Sclerenchyma Tissue Characteristics
Dead at maturity
2* walls
No de/redifferentiation
Function of Parenchyma Cells
Photosynthesis, Storage, Respiration, Regeneration
Function of Collenchyma Cells
Support for HERBACEOUS plants (no 2* growth)
Function of Sclerenchyma Cells
Support in plants that have ceased elongation, Economical importance (flax fibers for fabrics and ropes)
Chlorenchyma
Specialized Parenchyma
Contain chloroplasts

Storage Parenchyma
Stores pigments

Transfer Cells
Specialized Parenchyma
Short distance transport
Associated w/ vascular tissues and conducting cells

Arenchyma
Specialized Parenchyma
Air cavities
Aquatic plants
Oxygen diffusion

Angular Collenchyma
Hemicellulose and ligning in angles between cells

Lamellar Collenchyma
No intercellular space, compactly arranged, found in petiole of leaves

Lacunar Collenchyma
Variation of angular type, spherical/oval cells, small intercellular spaces, in fruit walls

Fibers
Specialized Sclerenchyma
Elongated, thin
Generally thin
Supportive tissues
Xylem and Phloem fibers

Sclereids
Specialized Sclerenchyma
Living or dead
No further growth
Support, Strength, Defense
Relatively short
