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Lecture 16

BIOL 101 Lecture 16: ch 34

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Course Code
BIOL 101

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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, 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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