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Plant Organs: Stems
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Function of stems
–
Support for leaves
–
Some carry on photosynthesis
–
May be specialized for storage
–
Transport of materials between leaves and roots
Stems structure
•
Usually upright and aerial
•
May be herbaceous or woody
Herbaceous Dicot Stems Order
•
Epidermis
–
Cuticle
•
Cortex
–
Collenchyma
and parenchyma (?
chlorenchyma
)
•
Vascular Bundles
–
Arranged in circular array with phloem toward periphery and xylem inside
–
Patch of Phloem Fibers generally present on bundles
•
Pith
–
Parenchyma
Monocot Stems I Characteristics
•
Herbaceous
•
Epidermis with cuticle
•
Cortex containing
collenchyma
and parenchyma cells
•
Vascular bundles scattered throughout cortex
•
No clear distinction between cortex and pith
•
Generally no secondary growth
Woody Dicot Stems
•
Periderm
–
Cork + Cork cambium
•
Cortex (???) ---
Collenchyma
and parenchyma
•
Primary Phloem
•
Secondary Phloem
•
Vascular cambium
•
Secondary Xylem
•
Primary Xylem
•
Pith
•
Secondary growth gives rise to cylinders of vascular tissue.
Function of stems
Holds up leaves and flowers
•
Provides pathway for transport
Types of stems
herbaceous
woody
Author
DesLee26
ID
204444
Card Set
Plant Organs: Stems
Description
Plant Organs
Updated
2013-03-02T17:51:40Z
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