the plant kingdom (part i) kingdom characteristics
TRANSCRIPT
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The Plant Kingdom (Part I)
Kingdom Characteristics
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Engage Doom’s Day Vault Video
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Explore Plant Kingdom Lab
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Explain
Multicellular, Eukaryotic, Autotrophic-Photosynthetic
Plant Cells 1. Cell walls of cellulose
2. Chloroplasts
3. Large central vacuole
4. Cuticle: waxy waterproof coating
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Plant Origin First plants
1. 500 mya
2. Looked like mosses
3. Probably evolved from green algae Cellulose cell walls Same type of chlorophyll Store excess food as starch
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Evolution of Plants(Cladogram)
Floweringplants
Cone-bearingplants
Ferns andtheir relatives
Mosses andtheir relatives
Green algaeancestor
Flowers; SeedsEnclosed in Fruit
Seeds
Water-Conducting(Vascular) Tissue
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Adaptations of Plants to Land
Seeds (Dormant until water added) Roots Stems Leaf – Autotrophic Organisms Must Conserve Water (Stomata) Reproductive Strategies
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Roots, Stems, and Leaves
Plant Tissues
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Dermal tissue
Vascular tissue
Ground tissue
Stem
Root
Leaf
Root, Stem, and Leaf Tissues
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include
includes includes includes
includes includes
Section 23-1
Plant Tissues
Dermaltissue
Meristematictissue
Vasculartissue
Groundtissue
Epidermalcells Xylem Phloem Parenchyma
cellsCollenchyma
cellsSchlerenchyma
cells
Tracheids Vesselelements
Sieve tubeelements
Companioncells
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1. The Seed External Structures 1. Seed coat 2. Hilum 3. Micropyle Internal Structures 1. Embryo plant 2. Cotyledon
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Germination – To Begin to Grow
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2. Roots: Anchors Away Functions
Anchors the plant Absorbs water and minerals from soil Stores food
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Primary Root The first root to
develop from the seed.
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Secondary Roots
Develop from the primary root and from themselves.
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Tap Root System Develops from the
primary root. Reaches deep into the
ground Helps the plant during
periods of drought.
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Fibrous Root System Develops when the
secondary roots become the main roots.
Shallow roots but spread over a broad area.
Helps prevent erosion.
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Epidermis
Ground tissue(cortex)
VascularCylinder
Cross Section of Plant Root(magnification: 40x)
Ground tissue (cortex)
Epidermis
Endodermis
Vascular cylinder
Root hairs
Phloem
Xylem
Apical meristem
Root cap
Zone of maturation
Zone of elongation
Endodermis
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The Root Tip Root cap
(Protects the root from abrasion)
Apical Meristem (Produces new cells for growth)
Zone of Elongation (Cells elongate allowing the root to grow longer)
Zone of Maturation (Cells develop into tissues)
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3. Stems: The Connector
Functions Connects the leaves with the roots Displays the leaves for maximum sunlight
exposure. Stores food Minor photosynthetic ability Contains vascular tissue
Phloem – transports sugars from leaves Xylem – transports water and minerals from roots
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Comparing Primary and Secondary Growth of StemsComparing Primary and Secondary Growth of Stems
Characteristics
Where It Occurs
Effect on Plant
How It IsProduced
Characteristics
Where It Occurs
Effect on Plant
How It IsProduced
Primary GrowthPrimary Growth Secondary GrowthSecondary Growth
At ends of plants
Increases plant length
By cell division in the apical meristem
In stem
Increases stem width
By cell division in meristems other thanthe apical meristem
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A. Vascular cambium appears
B. Secondarygrowth continues
C. Mature stemdevelops
Epidermis
Cortex
Primaryphloem Vascular
cambiumPrimaryxylem
Pith
Secondaryphloem
Secondary xylem
CorkCorkcambium
Primaryphloem
Secondaryphloem
Secondary xylem
Primaryxylem
Bark
Wood
Secondary Growth in Stems
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Wood Bark
Cork
Cork Cambium
Phloem
Vascular Cambium
Xylem: Sapwood
Xylem:Heartwood
Layers of a Tree Trunk
Contains old, nonfunctioningxylem that helpssupport the tree
Contains active xylem that transports water and minerals
Produces new xylem and phloem, which increase the width of the stem
Transports sugars produced by photosynthesis
Produces protective layer of cork
Contains old, nonfunctioning phloem that protects the tree
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4. Leaf - Autotrophic Functions
Carries on Photosynthesis Stores food Regulates transpiration through stomata
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Section 23-4
Veins
Xylem
PhloemVein
Cuticle
Epidermis
Palisademesophyll
Epidermis
Stoma
Guardcells
Spongymesophyll
Internal Structure of a Leaf
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Internal Leaf Anatomy Cuticle Epidermis Palisade Mesophyll
(chloroplasts) Spongy Mesophyll Vein (xylem and phloem) Air Spaces Lower Epidermis Stomata Guard cells
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Sugar Transport in Phloem
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Nutrient Transport Occurs in PHLOEM Pressure-flow hypothesis
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5. Water Conservation Cuticle
Waxy outer coating that prevents water loss
Stomata Openings for gas
exchange Open to release water,
Close to conserve
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Stomata
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Stomata Guard cells regulate the
size of the stoma. K+ (potassium ions)
enter the cells causing them to fill with water.
This opens the stoma when they become turgid.
A loss of K+ causes the opposite to occur, and they close when they become flaccid.
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Section 23-4
Stoma Open Stoma Closed
Guard cells
Inner cell wall
Stoma
Guard cellsInner cell wall
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Section 23-4
Stoma Open Stoma Closed
Guard cells
Inner cell wall
Stoma
Guard cellsInner cell wall
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Transpiration
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Water Transport1. Root Pressure2. Capillary Action
Adhesion – attraction between unlike Cohesion – attraction between like
3. Transpirational Pull Pulling water up through the vascular tissue
due to evaporation and capillary action
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6. Reproductive Strategies1. Seeds
Contains an embryo Contains a food supply Covered by a protective coat
2. Spores Single haploid cell with hard outer wall
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Elaborate Xylem Demonstration The Magic Toothpick Linking Up Demonstration Stomata Lab Transpiration Lab
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Evaluate