Plant Organs: Roots

Home

Get App

Create

Funciton of roots
- –Anchorage
- –Absorption of water and minerals from soil (assisted by root hairs)
- –Food storage in some
Types of roots
- –Fibrous- no main root, highly branched
- –Taproot- one main root with many small branches
Roots endodermis
- •Endodermis --- the innermost cortex layer
- –Specialized parenchymal cells whose lateral and tangential walls are embedded with suberin (Casparian strip)
- –Force water and minerals to enter cells , because the casparian strip inhibits movement between cells or in cell walls
Roots pericycle
- •Pericycle
- –Gives rise to branch roots
Herbaceous Dicot Roots Order
- •Epidermis with root hairs, no cuticle
- •Cortex
- •Endodermis with Casparian strip
- •Vascular Cylinder (= Stele)
Herbaceous Dicot Roots Vascular Cylinder= stele
- –Pericycle
- –Xylem arranged in geometric array (star or cross) in center of root
- –Phloem wedges on outside of xylem in between xylem arms
- –No pith
Woody Dicot Roots
FUnction

•Functions in support & anchorage, not absorption
Woody dicot roots dermal and vascular tissue
- •Periderm (replaces epidermis)
- –Cork and cork cambium
- •Vascular Cambium produces secondary xylem toward the inside and secondary phloem toward outside
Monocot Roots order
- •Epidermis with root hairs; no cuticle
- •Cortex- collenchyma and parenchyma
- •Endodermis with Casparian Strip
- •Pericycle
- –Outermost layer of stele
- –lateral meristem- gives rise to lateral roots
- •Vascular Stele
- –Xylem arranged in circular fashion with patches of phloem between
- Pith

Author

DesLee26

204443

Card Set

Plant Organs: Roots

Description

Plant Organs

Updated

2013-03-02T17:45:03Z

Show Answers