Leaves.

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Presentation transcript:

Leaves

I. Functions of Leaves A. Collect Light for Photosynthesis Shape? Thin & Flat B. Store Food E.g. Onion = underground stem, thick, fleshy leaves to store food

I. Functions of Leaves C. Store Water E.g. succulents D. Protection from animals E.g. Euphorbia Jade plant

II. Leaf Structure A. Petiole (attaches leaf to stem) B. Blade (Leaf)

II. Leaf Structure C. Epidermis 1. Cuticle (waxy, prevents water loss) 2. Stomata (control gas exchange & water loss)

II. Leaf Structure D. Internal structure 1. Mesophyll ♦ Leaf center, many chloroplasts ♦ Two layers a. Palisade Layer ♦ just under upper epidermis ♦ site of most photosynthesis

II. Leaf Structure b. Spongy Layer ♦ cells loosely packed with air spaces ♦ site of gas exchange 2. Veins - vascular bundles in leaves 3. Bundle Sheath - separates vascular bundles from mesophyll

III. Leaf Types A. Simple B. Compound

IV. Venation Patterns A. Parallel (monocots) B. Branching (dicots) 1. Pinnate 2. Palmate

V. Leaf Margins A. Entire (no cuts) B. Serrate (toothed) C. Lobed (deep cuts)

VI. Leaf Adaptations A. Succulents B. Needles C. Spines D. Insect Traps