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Lecture 20

BI111 Lecture Notes - Lecture 20: Lignin, Cork Cambium, Pith


Department
Biology
Course Code
BI111
Professor
Tristan Long
Lecture
20

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PLANT STRUCTURES AND ADAPTIVE IMPORTANCE PT.2 FEB 24.2016
XYLEM
oDead 2 types
oWater and mins
oLignin and sec wall
PHLOEM
oSugar and solutes
oLiving
oBody of plant
oJoined end to end in sieve tube cells
oParenchyma cells unload org compounds
oSieve wall = end wall pores
VASC TISSUE
oVasc bundles
oPrimary phloem and xylem in each bundle
MONOCOTS
o One cotyledon seed leaves in plant embryos
oScattered in ground tissue
EUDICOTS
o2 cotyledons
oCircle form outer cortex inner pith
oPhloem outside
oXylem inside
DERMAL TISSUE
oEpidermis plant body protection
oCuticle layer water loss
oGuard cells in leaf stomata for gas
oTrichores hair
oAbsorbent root hairs
PERIDERM
oCork
oCork cambium
oSec cortex
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