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Understanding Leaf Structures: Functions, Types, and Adaptations

Explore the functions, types, and structures of leaves, including veination patterns, adaptations, and classifications of monocots and dicots. Test your knowledge with a quick quiz on leaf anatomy.

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Understanding Leaf Structures: Functions, Types, and Adaptations

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Presentation Transcript

  1. LEAVES Headings Vocabulry Important Info

  2. Leaves 1. Function: a. Site of photosynthesis 2. Types: a. Simple-single blade b. Compound- leaf is made up of several parts

  3. 3. Veination a. Pinnate Leaves- have central vein, all others rise from it b. Palmate veins- veins arise from central spot, usually have 5 main veins c. Parallel veins- veins all run in parallel lines down length of leaf

  4. 4. Arrangement • Whirled - leaves whirl around stem • Alternate- leaves alternate on stem from one side to another • Opposite- leaves are directly opposite each other

  5. 5. Structures: • Petiole - stalk joining leaf blade to the stem • Cuticle -waxy covering to protect from water loss • Palisade layer-column shaped cells containing chloroplasts, site of most photosynthesis

  6. Spongy Mesophyll - loosely packed w/ air spaces allowing gases to circulate • Stomata - openings in leaf for gas exchange • Guard cells - cells which controlsizeof the stomata

  7. 6. Leaf adaptations A. Spines- cactus spines protect the plant from predators & water loss B. Tendrils- leaflets are modified for climbing C. Thick leaves - modified for water storage D. Pitcher Type Leaves -modified for catching insects

  8. 7. MONOCOTS & DICOTS Monocots– flower parts in multiples of three Dicots – 4 or 5 flower parts, or multiples of 4 or 5 • Classification by # of seed leaves (cotyledons): • Seeds sprout 1 leaf – Monocot, • Seeds sprout 2 leaves – Dicot

  9. Quick Quiz

  10. A _____ leaf has veins that run in parallel lines • A. root hair B. parallel veins C. root D. palmate vein • 2. Protects from water loss A. petiole B. cuticle C. palisade layer D. spongy mesophyll • 3. Site of most photosynthesis A. petiole B. cuticle C. palisade layer D. spongy mesophyll • 4 Identify the type of plant adaptation • A. Spine B. tendril C. thick leaves D. pitcher type

  11. 5. Identify this part of the leaf • Petiole • Spongy Mesophyll • Cuticle • Lower epidermis

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