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Roots (Internal Structure of Roots ((Root Apical Meritism ((Quiscent…
Roots
Internal Structure of Roots
Root Apical Meritism
Quiscent Center
Believed to be a reserve for a healthy cell
Resistant to harmful agents
Mitotically Inactive
Cells become active
Zone of Elongation
Zone elongation
Cells Expand Greatly
Differentiation
Ground Tissue
Root Cortex
Root Cap
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Mature Portions of The Root
Passage Cells
only casparian strips
Slow Development
Root Pressure
Other Types of Roots
Prop Roots
epiphytic
Attached to Branch
Adapted to Drought
Contractile Roots
Roots firmly anchor in soil
stem is pulled downwards
root surface becomes wrinkled
Uppermost portions contract
Storage Roots
Carbohydrates
Permanent organs in biennial species
datura
Phlox
daisies
Permanent organs in many perennials
beets
carrots
Celery
Roots of Strangler Figs
Roots cling to bark of host tree
Grow Rapidly Downward
hug the tree trunk
External Structure of Roots
Organization of Root Systems
Enormous Absorptive Area
Lateral Roots
Branch Roots
Branched Root Systems
Develops from Radicule
Embryonic Root
Beats
Turnips
Carrots
Structure of Individual Roots
No Leaf Axels
No Auxiliary Bud
No leaf Scars
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No leafs
Origin of Roots
Initiated by cell division and pericycle
small root primordium
forms root cap
breaking through endodermis
