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Lecture 16

BIOL 101 Lecture 16: ch 34

4 pages75 viewsFall 2016

Department
Biology
Course Code
BIOL 101
Professor
Brokaw
Lecture
16

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Leaf structure and function
-------- are the cells surrounding tiny pores in the epidermis that facilitate the diffusion of
carbon dioxide into leaves or herbaceous stems.
Guard cells
Basic leaf structure
STRUCTURE:
Broad, flat part of leaf
PETIOLE:
Stalk like part of leaf
STIPULES:
Small, leaf-like outgrowths from the base
Generally below an AXILLARY BUD
Leaf Form:
Simple
Having a single blade
Compound
Having a blade divided into 2 or more leaflets
Leaflets do not have axillary buds
Leaf arrangement:
On a stem
ALTERNATE: One leaf at each node
OPPOSITE: two leaves at each node
WHORLED: 3 or more leaves at each node
Epidermis:
Covers upper and lower surfaces of leaf blade
Mostly transparent protective cells (no chloroplasts)
Some specialized cells: guard cells, hairs
hair=trichomes
Waxy cuticle
Coats epidermis
Inhibits water evaporation
Guard cells for stomata:
Stomata: small pores in epidermis
Permit gas exchange for photosynthesis
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