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Leaves (Internal structure foliage (trichomes (more vulnerable to…
Leaves
Internal structure foliage
transportation
water loss is through there epidermis
this is a serious problem when the soil becomes dry
guard cells
granular and nongranular
must be translucent
waterproof
large tubular flat epidermal cells
epidermis
hairy
trichomes
more vulnerable to predators
provides some shade for the leaf
blocks excessive sun rays
stomata
sucked into epidermis
region of nonmoving air
oleander
lower leaf epidermis
many crypts
where epidermis is deep in the leaf
mesophyll
ground tissue
palisade parenchyma
exposure to intercellular surfaces
upper surface
main photosynthetic tissue
one layer thick
spongy mesophyll
CO2 diffusion is fast
lower portion
open lose aerenchyma
is either located in the center or is lacking of all together
vascular tissue
between the palisade and spongy mesophyll
midrib
lateral veins emerge
move to minor veins
responsible for the release of H2O
H2O from xylem sugars from phloem
evolved in conduction
link to coggle.it
external structure foliage
veins
bundles of vascular tissues
the veins distribute H2O to leaf
collects sugars produced by photosynthesis
eudicots
reticular venation
process is in the netted pattern
monocots
parallel venation
run side by side
can't be too nutritious to animals
it can't lose a lot of H2O
abscission zone
perpendicular to the petiole
cuts off leaf when useful life is over
leaf scar
become corky
protective scar tissue is formed
the undamaged cell swell
cant allow bacteria, fungi or algae in
Photosynthesis would be useless
absorb CO2
the carbohydrates are converted via light
Lead Blade
compound or simple
simple
blade is one part
compound
the small blades are called leaflets
tough
the blade is divided into many parts
light harvesting portion
lamina
dorsal surface
large veins protrude like a backbone
lower side of the blade
upper side
adaxial
smooth to touch
ventral surface
petiole
Salk
holds out blade to the light
prevents shading
flexible for wind blowing
keep insects off
sessile leaf
no petioles
small/ very long/ narrow
sheathing of blade leaf
leaf wraps around the base
can flex and flutter
morphology and anatomy of other leaf types
Succulent leaves
H2O loss through the stomata
circular shaped
reduces surface to volume ratio
Family: crasslaceae
thick and fleshy
H2O conservation
few air spaces
tendrils
grows indefinitely
cells that sense contract
cause that side to stop growing
other side grows
plant begins to coil
sclerophyllous
use own construction snd metabolism
hardness protects against animals, fungi and bacteria
bed scales
petiole are small or nonexistent
small and not compound
most common modification
protected from low temperatures and drying
dormant shoot apical meristems
tough waxy leaves for protection
insect trap
absorbs instead of impermeable
capable of photosynthesis
trap and digest insects
thin leaves
lamina secretes watery digestive
initiation and development of leaves
basioangiosperm
leaf primordium
increases in thickness
contains ground meristem and protoderm
protoderm growing outward
grows fast
all are meristematic
eudicot
monocots
some become broad and expand
apical meristem adjacent to protoderm
hook like shape
basil expansion
protaoxylem
protophloem
stretched and disrupted by Basil meristem
