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LEAVES

LEAVES. The primary PHOTOSYNTHETIC ORGAN I will be able to label the parts of a leaf by completing a leaf lab. FUNCTIONS of LEAVES. PHOTOSYNTHESIS Conversion of LIGHT ENERGY into SUGARS CARBON DIOXIDE (CO 2 ) and WATER (H 2 O ) needed RESPIRATION (leaves, stems and roots)

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LEAVES

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  1. LEAVES The primary PHOTOSYNTHETIC ORGAN I will be able to label the parts of a leaf by completing a leaf lab.

  2. FUNCTIONS of LEAVES • PHOTOSYNTHESIS • Conversion of LIGHT ENERGY into SUGARS • CARBON DIOXIDE (CO2) and WATER (H2O) needed • RESPIRATION (leaves, stems and roots) • Breakdown of SUGAR into ENERGY • ENERGY is needed for GROWTH and to MANUFACTURE other compounds • OXYGEN (O2) needed

  3. FUNCTIONS of LEAVES • TRANSPIRATION • DIFFUSION of WATER VAPOR out of leaves through STOMATA • GAS EXCHANGE • TRANSPIRATIONAL PULL • COOLING

  4. PARTS of a LEAF- DRAW!

  5. BLADE • Thin, flattened portion

  6. Midrib • Large vein running down the center

  7. Veins • The framework of the leaf

  8. PETIOLE • STALK that attaches leaf to stem • ROTATES blade for maximum sunlight • Greater FLEXIBILITY in wind and rain

  9. SESSILE- NO PETIOLE • When BLADES attached DIRECTLY to stem

  10. STIPULE • Leaf-like or scale-like APPENDAGE at base of PETIOLE

  11. AXIL • ANGLE between leaf and stem • AXILLARY bud located here

  12. NODE • Area on stem where leaf arises

  13. Assignment • You will go outside and find 3 different types of leaves. • Tape your leaves to a sheet of notebook paper • Label the following parts on your leaf: • Blade • Petiole or Sessile • Midrib • Veins • When done turn in on front table in the wire basket

  14. CLASSIFICATION and ANATOMY of LEAVES I will be able to classify different leaves and identify if they have any modifications by completing a chart.

  15. SIMPLE One blade per petiole COMPOUND Many leaflets per petiole DECIDUOUS LEAVES

  16. TYPES of COMPOUND LEAVES • PINNATELY COMPOUND • Leaflets arranged on stem like a FEATHER • PALMATELY COMPOUND • Leaflets arranged on stem to RADIATE like the PALM of HAND

  17. VENATION of LEAVES • Pattern of VEINS in a leaf • PARALLEL - monocots • NETTED - dicots • PINNATE- feather • PALMATE- palm

  18. LEAF ARRANGEMENT • MUST have STEM to determine leaf ARRANGEMENT • ALTERNATE – one leaf per node • OPPOSITE – two leaves per node • WHORLED – three or more leaves per node, each leaf is the SAME SIZE

  19. EVERGREEN LEAVES • BROADLEAF • Tree or plant with WIDE FLAT leaves • NEEDLED • Tree or plant with THIN POINTED leaves • SCALED • Small and tightly pressed to the stem

  20. ANATOMY of LEAVESLabel your paper and color it

  21. EPIDERMIS One cell layer thick, top and bottom of leaf NO CHLOROPLASTS present Cuticle- waxy layer for protection Stomata- gas exchange and transpiration Guard Cells- surrounds stoma and contains chloroplast ANATOMY of LEAVES

  22. LEAF MODIFICATIONS • SUPPORT • Thick Petioles • Rhubarb and celery • Captured Gas • Aquatic plants

  23. LEAF MODIFICATIONS • WATER STORAGE • Succulents • FOOD STORAGE • Scales on Bulbs • Cabbage and Brussel sprouts

  24. LEAF MODIFICATIONS • CLIMBING • Tendrils (right) on peas • Leaf petioles (below) on Clematis

  25. LEAF MODIFICATIONS • PROTECTION • Spines (right) • Cacti • Bracts (below) • Poinsettia

  26. INGESTION Carnivorous plants Venus Fly Trap (above) Sundew (left) LEAF MODIFICATIONS

  27. Assignment • Leaf sort worksheet

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