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Flowering plants - generally have well developed shoots and roots systems
Monocots (grasses, lilies & orchids)
Dicots (nearly all familiar trees & shrubs)
Plant Organs
Plant Organs
Roots
Roots
Absorbs water and dissolved nutrients.
Stores food.
Anchor plants in the ground.
Protect the plant from harmful soil bacteria and fungi.
Stems
Stems
Support system for the plant body.
Transport system that carries nutrients.
Defense system that protects the plant against predators and disease.
Leaves
Leaves
Photosynthesis - food creation - Chemical equation below.
Chlorophyll - green pigment, present in all green plants and in cyanobacteria, responsible for the absorption of light to provide energy for photosynthesis.
Plant Tissue Systems
Plant Tissue Systems
A tissue can be defined as groups of cells working together to perform a specific job or task. All 3 tissues are present in all organs.
Dermal (epidermis)
Single layer
Protective, outer layer
Vascular
Xylem: Water transport
Tracheids & vessel elements
Phloem: Food transport
Ground (neither dermal nor vascular)
Pith: Internal to vascular tissue
Cortex: External to vascular tissue
Plant Cell Types
Plant Cell Types
Parenchyma
Parenchyma
Thin & flexible primary cell walls
“typical cells” – least specialized
Perform most metabolic processes of cell
Usually no secondary walls
Collenchyma
Collenchyma
Thicker primary walls (unevenly thickened)
Support parts of plant that are growing
No secondary walls
Sclerenchyma
Sclerenchyma
Thick secondary walls
Specialized for support
Two types
Fiber - long
Sclereids – shorter, harde
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