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Tissues and the Primary Growth of Stems (Basic Types of Cells and Stems…
Tissues and the Primary Growth of Stems
Basic Types of Cells and Stems
Collenchyma
thin in some areas
thickened in others
Sclerenchyma
primary wall
thick secondary wall
almost always lignified
Parenchyma
thin primary walls
parenchyma tissue
mass of parenchyma cells
Internal Organization of Stems:
Arrangement of Primary Tissues
Vascular Tissues
phloem
distributes sugars and minerals
xylem
conducts water and minerals
Cortex
interior of epidermis
composed of
collenchyma
photosynthetic parenchyma
Epidermis
single layer
living parenchyma cells
outermost surface
cutin
fatty substance
makes wall impermeable to water
