View
214
Download
1
Embed Size (px)
Citation preview
Why Protect A Dying Leaf?
• 42.1 - How Are Plant Bodies Organized; How Do They Grow? p. 860
• 42.2 - The Tissues and Cell Types of Plants? p. 862
• 42.3 - The Structures, Functions of Leaves, Roots, & Stems? p. 865
• 42.4 - How Do Plants Acquire Mineral Nutrients? p. 873
• 42.5 - How Do Plants Move Water Upward from Roots to Leaves? p. 876
Chapter #42 – Plant Anatomy & Nutrient
Transport7th Edition in Audesirk, Audesirk, and Byers
Chapter #24 – Plant Anatomy & Nutrient Transport
The Art and Science of
LivingSurvive (live)
Reproduce
Support the bodyObtain water & nutrientsTransport water & nutrientsObtain energyGrow and DevelopExchange gases?Protection from Herbivory
Angiosperms (Monocots and
Dicots)
• Flowering plants (called Angiosperms) are divided into two groups (monocots and dicots) based on the structure of their flowers, leaves, vascular tissue, roots, and seeds.
A. Largest phylum of living plants.B. 250,000 + species.C. Seeds enclosed by fruits.
Plant AnatomyRoots & Shoots• Root and shoot
systems are made up of basic plant organs: roots, leaves, stems, flowers.
Root System
Functions• Anchor plant.• Absorb water
and minerals.• Store sugar as
starch.• Transport
materials• Produce some
hormones.• Interact with
soil microbes.
• Photosynthesis (primarily in leaves)
• Transport of materials (water, minerals, sugars, and hormones among leaves, flowers, fruits, and roots)
• Reproduction• Hormone synthesis
Shoot System
Functions
Angiosperms (Monocots and
Dicots)
• Monocots have one cotyledon (seed leaf)– e.g. grasses, lilies, palms, orchids
• Dicots have two cotyledons (seed leaves)– e.g. deciduous trees (drop leaves
in winter), bushes, many garden flowers
Structure is used in classification
Monocots: flower parts in
3’s Dicots: flower parts in 4’s, 5’s,
6’s
Flowers
Monocots: parallel veins in leaves
Dicots: network of veins in the
leaves
Leaves
Monocots: small vascular bundles
scattered throughout the
stem.
Dicots: large vascular bundles
arranged in a ring around the
stem.
Stems
Monocots: fibrous root
system with no main tap root.
Dicots: Main tap root, with smaller
side roots branching off.
Roots
Monocots: single cotyledon;
endosperm and cotyledon are
separate.
Dicots: two cotyledons;
endosperm is contained in the
cotyledon.
Seeds
Plant Tissues
Dermal Tissue- Epidermis- Periderm
Ground Tissue- Parenchyma- Collenchyma- Sclerenchyma
Vascular Tissue- Xylem- Phloem
• Covers flowers, seeds, fruit.
• Secretes a waxy substance called cuticle (cuticular membrane - hydrophobic) as waterproofing.
• May produce special structures such as hairs (root hairs). Why?
Dermal Tissue:
Epidermis
Dermal Tissue:
Periderm• Replaces epidermis on roots and stems of woody plants with age.
• Composed mainly of thick, waterproof cork cells.
• Protects stems and roots.
• Anchor system (doesn’t absorb water & minerals).
Plant Tissues
Parenchyma
Collenchyma
Sclerenchyma
• Non-dermal, non-vascular.
• Thin-walled cells• Alive at maturity• Many functions,
including photosynthesis, starch storage, hormone production.
Ground Tissue:
Parenchyma
• Flexible support tissue.
• Elongated cells with irregular shapes and unevenly thickened walls.
• Living at maturity.
Ground Tissue:
Collenchyma
• Support tissue.• Elongated cells
with thick cell walls.
• Dead at maturity.
• Forms long fibers, or smaller sclerids (such as stone cells in pears).
Ground Tissue:
Sclerenchyma
• Sclerenchyma fibers
• Long, tube-like cells, joined end-to-end, that transport water and minerals from soil to leaves.
• Two types of cells: tracheids (in conifers) and vessel elements (in flowering plants).
Vascular Tissue: Xylem
• Tissue that transports dissolved sugars (sap) in a plant.
• Two types of cells:• Sieve tubes
(alive but no nucleus)
• Companion cells
Vascular Tissue: Phloem
In Review. . . .
Monocots
In Review. . . .
Dicots
Why Protect A Dying Leaf?