Chapter 33 - Leaf Structure and Function

Chapter 33 - Leaf Structure and Function - James Truong...

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James Truong 1 Chapter 33 - Leaf Structure and Function Leaves o Broad, flat blade o Stalklike petiole o Some also have stipules Small, leaflike outgrowth from the base (usually come in pairs) o Axillary bud – where a petiole meets a stem (how you tell it’s not another branch) o Veins – vascular tissue Characterize Leaf o Shape (round, needle, fan, heart) Leaf Form Simple – having a single blade Compound – having a blade divided into 2 or more leaflets Pinnately – branching in succession Palmately – branching off from one point o How leaves attach to stem Leaf Arrangement On a stem o Alternate (one leaf at each node) o Opposite (two leaves at each node) o Whorled (three or more leaves at each node) o Venation (pattern of veins inside the leaf) Parallel (monocot) Netted (dicot) Pinnately netted – veins branching along entire length of the midvein Palmately netted – several major veins radiating from one point Epidermis o Covers upper/lower surfaces of leaf blade o Secretes a waxy cuticle - Helps plants survive in dry terrestrial conditions Cutin makes up the cuticle o Lack chloroplasts, clear; have stomata and guard cells Guard cells have chloroplasts Open when water goes in through osmosis; turgor pressure opens the cell; turgid Closes when turgor pressure leaves the cell o Cell walls of epidermal cells have a hard outer layer o Trichomes – hairs on stem or leaves Many sizes, shapes, and functions Protect the plant: reflect light, help with salts, produce toxins through nettles
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Chapter 33 - Leaf Structure and Function - James Truong...

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