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Leaf classification combined
 

Leaf classification combined

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    Leaf classification combined Leaf classification combined 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. 5th 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 Friday, 10/11
    • Classification What is classification? What are three different ways leaves can be classified? If you had a collection of insects, what ways might you classify them?
    • Summary: Vascular Plants Describe how all the cells in a vascular plant get sugar. Describe how all the cells in a vascular plant get water and minerals. Why do its leaves turn pink when a celery stalk is placed in red water? In what way are blood and sap the same?
    • Name That Leaf  Palmate Leaf
    • Name That Leaf  Parallel Leaf
    • Name That Leaf  Pinnate Leaf
    • Could These Leaves Come From the Same Plant?  Why?
    • Could These Leaves Come From the Same Plant?  Why?