7th Grade Chapter 2 Lesson 6

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7th Grade Chapter 2 Lesson 6

  1. 1. Chapter 2 Lesson 6 Pgs. 62-64 For Student Use Only
  2. 2. Observing Leaves <ul><li>Leaves are al different, but they are also alike. </li></ul><ul><li>All leaves produce food for plants. </li></ul><ul><li>All leaves have some basic shape. </li></ul>
  3. 3. Observing Leaves <ul><li>All leaves have 4 basic shapes: </li></ul><ul><ul><li>Broad, Flat Leaves </li></ul></ul><ul><ul><li>Long, Narrow Leaves </li></ul></ul><ul><ul><li>Needlelike Leaves </li></ul></ul><ul><ul><li>Scaly Leaves </li></ul></ul>
  4. 4. Observing Leaves <ul><li>Leaf Arrangements: </li></ul><ul><ul><li>Opposite- grow in pairs from a point in a stem and opposite sides </li></ul></ul><ul><ul><li>Alternate- individual leaves that grow in an alternating pattern along the stem </li></ul></ul>
  5. 5. Observing Leaves <ul><li>Leaf Arrangements: </li></ul><ul><ul><li>Whorled- three or more leaves growing from the same point or node on the stem </li></ul></ul><ul><ul><li>Rosette (or basal)- a cluster of leaves growing around the base of the plant </li></ul></ul><ul><ul><li>All leaves fit one of these common arrangements. </li></ul></ul>
  6. 6. Observing Leaves <ul><li>Leaf Margins (or edges): </li></ul><ul><ul><li>You can identify plants also by edge of leaf </li></ul></ul><ul><ul><ul><li>Entire- smooth and unbroken lines </li></ul></ul></ul><ul><ul><ul><li>Toothed- jagged with small or large “teeth” </li></ul></ul></ul><ul><ul><ul><li>Wavy- curved bumps that look like ripples </li></ul></ul></ul><ul><ul><ul><li>Lobed- has lobes that come from one center </li></ul></ul></ul>
  7. 7. Observing Leaves <ul><li>Simple or Compound Leaves: </li></ul><ul><ul><li>Parts of Leaves: </li></ul></ul><ul><ul><ul><li>Petiole- a stalk that the blade of the leaf is attached </li></ul></ul></ul><ul><ul><ul><li>Blade- the broad, flat portion of a leaf </li></ul></ul></ul><ul><ul><li>Simple Leaves </li></ul></ul><ul><ul><ul><li>One blade attached to the petiole </li></ul></ul></ul><ul><ul><li>Compound Leaves </li></ul></ul><ul><ul><ul><li>More than one blade joined to a petiole </li></ul></ul></ul>
  8. 8. Observing Leaves <ul><li>Simple or Compound Leaves: </li></ul><ul><ul><li>Parts or Names of leaves: </li></ul></ul><ul><ul><ul><li>Leaflets: multiple blades of a compound leaf </li></ul></ul></ul><ul><ul><ul><li>Sessile- have not petioles and attach directly to the stem </li></ul></ul></ul>
  9. 9. Observing Leaves <ul><li>Simple or Compound Leaves: </li></ul><ul><ul><li>Leaf Venation </li></ul></ul><ul><ul><ul><li>Parellel Venation- the main veins run seemingly parellel to each other </li></ul></ul></ul><ul><ul><ul><ul><li>Monocots- parellel veins </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Dicots- branching veins </li></ul></ul></ul></ul><ul><ul><ul><li>Pinnate Venation- veins branching from one main vein </li></ul></ul></ul><ul><ul><ul><li>Plamate venation- small veins branching from more than one main vein </li></ul></ul></ul>
  10. 10. Observing Leaves <ul><li>Simple or Compound Leaves: </li></ul><ul><ul><li>Leaf Venation </li></ul></ul><ul><ul><ul><li>Palmately Compund- all leaflets attach to a common point at the tip of the petiole </li></ul></ul></ul><ul><ul><ul><li>Pinnately Compound- leaflets are located at intervals along the petiole </li></ul></ul></ul>

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