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Ch 7 Roots (Other Types of Roots and Root Modifications (Prop Roots (Roots…
Ch 7 Roots
Other Types of Roots and Root Modifications
Storage Roots
Store carbohydrates
Prop Roots
Roots that grow through air
Used to stabilize plant
Aerial Roots of Orchids
Spread across surface of bark
Contractile Roots
Roots Grow then contract back into plant
Gladiolus
Mycorrhizar
Symbiotic relationship with soil fungi
Root Nodules and Nitrogen Fixation
symbiotic relationship with nitrogen-fixing bacteria
Legumes
Haustorial Roots of Parasitic Flowering Plants
Very little root like structure
Roots of Strangler Figs
Root clings to bark of host
Internal Structure of Roots
Root Cap
Provides protection
Specific Structure
Layer closest to meristem= Meristematic Cells
Apical Meristem
Zone of Elongation
Just Behind Apical Meristem
Where cells expand greatly
Zone of Maturation/ Root Hair Zone
Root hairs grow outward
No distinct boundary between elongation
Mature Portions of Roots
Root hairs function for only several days
Absorption or H2O and minerals decrease
External Structure of Roots
Organization of Root Systems
Lateral Roots
Numerous + Small
Taproot
Main Root
Develops from Radical
Embryonic Root found in seed
Structure of Individual Roots
Root Cap
Protects the Apical Meristem
Zone of Elongation
Just behind Root cap + Meristem
Area of Cell division + Expansion
Root Hair Zone
Just behind elongation
Epidermal cells extend
Called Root hairs
Make up most of root surface area
Origin and Development of Lateral Roots
Endogenous Origins
Deep Within the Root