Leaf classification

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Leaf Classification
Investigation 2-2

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Leaf classification

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

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