Botany

Functions of roots
- absorption
- anchorage
- produce hormones
Root tip, longitudinal section
- root cap
- quiescent center
- region of cell division
- apical meristem
- region of elongation
- region of maturation
Root Cap
- protection
- gravity detection
- must be renewed (division)
- mucigel
Quiescent Center

Not much going on, no cell division
Region of Cell Division

above quiescent center
Apical Meristem
- (cells dividing)
- protoderm-fewer-outside cells
- ground maaristem
- procambium-becomes phloem and xylem
Region of Elongation

push cap thru soil
Region of Maturation

unicellular root hairs (only on parts not moving)
Procambium
- Part of Apical Meristem
- becomes phloem and xylem
Root Cross Section
- Epidermis
- Cortex-symplastic and apoplastic flow (carries water from out to in)
- endodermis
Cortex
- Root Cross Section
- Symplastic Flow- water goes thru cell
- Apoplastic flow- water goes around the cell (faster)
Endodermis
- Root Cross Section
- water forced thru cell b/c waterproof between cells
- Casparian strip-water proof band around cells
- Suberin-waterproofing substance
Casparian strip

water proof band around cells of endodermis in root cross section
Subrin

Substance that makes cells water proof (ex, in endodermis of root cross section)

Author

Anonymous

15570

Card Set

Botany

Description

Test 2

Updated

2010-04-21T22:00:58Z

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