lab #8 angiosperms. plastids amyloplasts – from garden bean chromoplasts – from red pepper
TRANSCRIPT
Lab #8 Angiosperms
Plastids
Amyloplasts – from garden bean
chromoplasts – from red pepper
Epidermal structures
Guards cells + Stoma
Trichome and leaf cross section
Mesophyll – Palisade and Spongy
spongy
palisade
epidermis
epidermis
Monocot Root
http://www2.mcdaniel.edu/Biology/botf99/rootuse/monovsdi.htm
pith
xylem(vessel element& tracheids)
phloem
pericycle
pith
Monocot root
xylem(vessel element& tracheids)
phloem
pericycle
endodermis
pith
Monocot stemsepidermis
parenchyma
Monocot Stem Vascular Bundle
xylem
sclerenchyma is called a bundle sheath inmonocot leaf vascular bundles
Monocot Leaf
Dicot Root
from Biology 311 site Alison Roberts ([email protected]) © 1998-2012 AWR
metaxylem
phloem
pericycle
endodermis
vascular cylinder = stele
Dicot Lateral Root
Dicot stems
from Biology 311 site Alison Roberts ([email protected]) © 1998-2012 AWR
Helianthus (sunflower)
phloem
vascularcambium
metaxylem
protoxylem
Trifolium (clover)
epidermis
cortex
pith
Dicot Stem
interfasicularcambium
fasicularcambium
sclerenchyma
xylem
pith
phloem
Dicot Stem Vascular Bundle sclerenchyma
tracheids
region ofprotoxylem
region ofmetaxylem
Dicot Leaf
Stained cross-section through the leaf of lilac: 1 upper epidermis, 2 palisade parenchyma, 3 spongy parenchyma, 4 air cavity, 5 lower epidermis, 6 stomata, 7 trichome, 8 major vein, 9 xylem, 10 phloem, 11 supporting tissue (sclerenchyma)http://www.vcbio.science.ru.nl/en/virtuallessons/leaf/mesomorph/
Dicot Leaf
Dicot vs. Monocot Vascular Bundles
from Biology 311 site Alison Roberts ([email protected]) © 1998-2012 AWR
DICOT
MONOCOT
Sclerenchyma
tracheid
Sclerenchyma
Dicot vs. Monocot Root
Monocot vs. Dicot Stem
DICOTMONOCOT
sclerenchyma
phloem
metaphloem
protoxylem
metaxylem
No vascular cambium – no secondary growth!
WATER-CONDUCTING CELLS OF THE XYLEM
Tracheids
Pits
Tracheidswith circular-bordered pitsin their primary walls TRACHEIDS
from Biology 311 site Alison Roberts ([email protected]) © 1998-2012 AWR
tracheids
perforation plates in the side walls of a vessel element
vessel elementswith perforation plates
VESSEL ELEMENTS
tracheids
xylem rayvessel element
perforationplate
perforation plate: the end wall of a vessel element where the secondary cell wall was not deposited and the primary cell wall has been digested.
Ash wood
from Biology 311 site Alison Roberts ([email protected]) © 1998-2012 AWR
Tracheids with annular thickenings
from Biology 311 site Alison Roberts ([email protected]) © 1998-2012 AWR
3 yr Tilia stem (Basswood)
secondary xylem(tracheids &vessel elements)
secondary xylem(tracheids &vessel elements)
secondary xylem(tracheids &vessel elements)
vascularcambium
secondaryphloem
cork
corkcambium
cork + cork cambium = peridermvascular cambium to cork = Bark
Cork Cambium
cork cambium
cork
from Biology 311 site Alison Roberts ([email protected]) © 1998-2012 AWR
lenticel
