Download Plant Structure 1

Plant Structure 1
Thursday, February 21, 2013
Kingdom Plantae
• Eukaryotic
• Autotrophic
• Multicellular
• Many cell types
• Cell walls - cellulose
• Reproductive cells encased in organs
• Alternation of generations
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Major Groups of Plants
Moss
Liverwort
Hornwort
Ferns
Horsetail
Club Moss
Spike Moss
Gymnosperms
Angiosperms
Flowers
Seeds
Vascular Tissue
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Flower Parts
Pistil
Stamens
Petals (corolla)
Sepals (calyx)
Receptacle
Peduncle
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Levels of Organization
•
•
•
•
Organism
Organs
Tissues
Cells
Flowers/Fruits
Leaves
Stem
Roots
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Tissue
• Group of cells with a particular function
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Meristematic Tissue
• Contains dividing cells
• Apical Meristem
• Increase length
• Lateral Meristem
• Increase diameter
Cork
Cambium
Vascular
Cambium
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Non-Meristematic Tisse
• Does not contain dividing cells
– Epidermal Tissue
– Ground Tissue
– Vascular Tissue
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Epidermal Tissue
• outer covering
stoma
Epidermis
-layer of single cells
-waxy cuticle
General
cells
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Guard
Cells
Epidermal Tissue
• outer covering
Peridermis
• Replaces epidermis in woody plants
• “Bark”
Cork Cells
Cork cambium
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Ground Tissue
• Fills the interior spaces
Parenchyma
Collenchyma
Figure 24.4
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Sclerenchyma
Vascular Tissue
• transport tissue
Xylem
water transport
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Phloem
food transport
Xylem
tracheid
• Dead at maturity
• 2 unique cell types
Vessel
Element
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Phloem
• Live at maturity
• 2 unique cell types
Sieve tube Companion
member
Cell
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Stem
• Axis to which leaves attach
• Support
• Growth
• Transport
• Storage (some)
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Axis
Internode
Node
Monocot Stem
Vascular
Bundles
Epidermis
Collenchyma
Ground Tissue
(Parenchyma)
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Monocot Vascular Bundle
Sclerenchyma
•Phloem
•Xylem
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Herbaceous Dicot Stem
Vascular
Bundles
Epidermis
Cortex
Pith
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Dicot Vascular Bundle
Sclerenchyma
Phloem
Vascular
Cambium
Xylem
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Woody Stem
Previous
Year Growth
Terminal
bud scar
Terminal
bud
Most Recent Growth
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Young Woody Stem 40X
xylem and phloem in rings
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Woody Dicot 2 Years Old
Vascular
Cambium
2o
Phloem
Bark
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Pith
2o
Xylem
Rings
Activity - Woody Stems
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