Leaf classification
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Leaf Classification

Leaf Classification
Investigation 2-2

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Leaf classification Leaf classification Presentation Transcript

  • Focus Question: How can leaves be classified? Living Systems 2-2
  • Focus on Leaves
    • Vascular plants are composed of millions of living cells
    • Every cell needs water, minerals, and food (sugar)
    • Vascular system of plants is really two systems
      • Xylem transports water and minerals to the cells
      • Phloem transports sugar to the cells
    • Most xylem tubes begin in the roots and end in the leaves.
    • Most phloem tubes start in the leaves and end in the roots.
    • Find out about the place where the xylem ends and the phloem begins, the leaf.
  • Leaf Collection
    • Stay with your group
    • Collect ONE leaf from as many different plants as you can find in 5 minutes. Get leaves of all sizes.
    • Keep sample in the bag.
  • Sorting Leaves
    • Look closely at each leaf
    • Sort into those that show evidence of xylem and phloem and those that don’t.
    • How many of your leaves have veins?
    • Are the veins all the same size?
    • Do the veins branch?
    • Sort your leaves in a new way.
  • Classification
    • Scientists organize, or classify, things so they can think about them more efficiently
      • A group of things that go together based on a property or behavior is a class.
      • 5 th graders form a class based on age. 4th graders are a different class, etc… In schools we classify students by age.
      • Geology – classify crystals by shapes and angles of surfaces. Classify sand by particle size.
  • Leaf Classification
    • Based on basic pattern of the veins.
    • Botanists have developed a systems that uses three patterns.
      • Palmate
      • Pinnate
      • Parallel
  • Palmate
    • Several large veins extending from the place where the leaf stem attaches to the leaf.
    • Think of the palm of your hand and your fingers as the main veins.
  • Pinnate
    • One large vein extending the length of the leaf with smaller veins branching off.
    • Pinna means feather, so a pinnate leaf resembles a feather
  • Parallel
    • Many small veins running the length of the leaf.
    • Long, narrow leaves, like blades of grass, tend to have parallel veins.
  • Leaf Classification
    • Classify your leaves based on venation pattern.
    • Are there other ways to classify your leaf collections?
      • Leaf Shape (Blade)
      • Kind of edge (Margin)
      • Kind of attachment (Petiole)
  • Vocabulary
    • Classify
      • To organize by similar properties or behavior
    • Palmate
      • Several large veins extending from the place where the leaf stem attaches to the leaf (Palm)
    • Pinnate
      • One large vein extending the length of the leaf with smaller veins branching off (Feather)
    • Parallel
      • Many small veins running the length of the leaf (Grass)
  • Content
    • Venation
      • Classifying leaves by their vein pattern
    • How do scientists organize objects and information?
      • Scientists classify things by putting them in groups (classes) based on similar properties and behaviors.
  • Homework
    • Read Classification, pg. 105-106, and Summary: Vascular Plants, pg. 107-109
    • Answer questions for both articles
    • I-check 2 quiz on Monday, 1/23