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Lecture 16

BIOL 101 Lecture 16: ch 34

4 Pages
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Department
Biology
Course Code
BIOL 101
Professor
Brokaw

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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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Description
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, leaflike 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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