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CH. 6 LEAVES (Other Leaf Types (Spines (Cacti cactus-prinly), Tendrils…
CH. 6 LEAVES
Other Leaf Types
Conifers
Bud Scales
Foliage
Spines
Cacti
Sclerophyllous
Tendrils
capable of sensing contact
Succulent
Leaves w/ Kranz
Kranz Anatomy
adapts C4 plants to arid environments
large chlorophyllous cells
Insect Traps
Functions of Leaves
Provide protection
Support
Photosynthesis
Storage
Nitrogen Procurement
trapping + digesting insects
Internal Structure of Foliage Leaves
Mesophyll
ground tissues interior to epidermis
palisade parenchyma
upper surface layer of leaf
spongy mesophyll
lower portion of leaf
Vascular Tissues
veins
minor
lateral
bundle sheath
bundle sheath extension
Epidermis
transpiration
water lost through epidermis
Petiole
transition between stem + lamina
External Structure Parts of Leaf
Petiole(stalk)
holds blade out in light
Rachis
extension of petiole
Petiolule
Sheathing leaf base
leafs wraps around base
Lamina or leaf blade
Ventral or upper side
adaxial
Dorsal or lower side
abaxial
Veins or bundles
distribute water from stem to leaf
collect sugars
Initiation/Development of Leaves
Eudicots
reticulate venation
where veins run
mid rib -midvein
branches out into lateral veins
branches into minor veins
apical meristem
leaf primordium
midrib
lamina
Monocots
apical meristem
leaf primordium
cylinder/tubular
Basal Angiosperms
reticulate venation
where veins run
Types of Leaf Blade
Compound leaf
blade divided into several parts
Simple leaf
blade of just one part
