Parts of-a-seedling 2013

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  • Students will notice that the soaked seed will be larger because it has soaked up water and the seed coat will slip off easily compared to the seed coat of the dried seed. Also, the soaked seed will come apart easily and the dry seed will not. The soaked seed will also feel and smell different from the dried seed.This is a good time to begin talking to students about seed dormancy. Seeds can remain dormant for a very long time, waiting for just the right conditions that would be ideal for the plant to survive. Most seeds need both warm temperatures and moisture to begin germination.Stress the importance of having students draw and label the parts of their lima bean seed.
  • Parts of-a-seedling 2013

    1. 1. Parts of a Seedling
    2. 2. Lima beans Lima beans have been cultivated in Peru for more than 7,000 years. The name "Lima," comes from the capital of the South American country of Peru. Historians are unsure whether they originated there or in Guatemala. The scientific name for lima beans is Phaseoluslunatus.
    3. 3. Epicotyl – contains the plumules at upper end that become part of the stem.
    4. 4. Why do seeds dry up, stay in their seed shape and not fall apart? Discuss with your partner- QUIETLY! Dry Lima Bean
    5. 5. observe and write down differences between the dry and wet seeds. at least 5! Dry Wet
    6. 6. • micropyle - the small pore in a seed that allows water absorption • hilum - the scar on a seed coat at the location where it was attached to the plant's stalk during development
    7. 7. • Look at the exterior of the dry and wet bean seed. • Draw and record what you see. Use your magnifying glass.  Print – no cursive  Pencil only  Draw EXACTLY what you see  Be NEAT and DETAILED  Use map pencils only to color  Spell correctly  Give your drawing a title  Label lines: straight and parallel to top of page
    8. 8. Label the cotyledon, embryo (if you see one), hilum and micropyle. Dry Lima Bean micropyle hilum
    9. 9. Wet Lima Bean embryonic root cotyledon Dry Lima Bean micropyle hilum
    10. 10. Embryonic Root
    11. 11. embryonic root
    12. 12. Carefully remove the testa (seed coat). Cotyledon Embryo • Try not to separate the cotyledons or let the embryo fall out.
    13. 13. Carefully, slide your fingernails into the seam on the convex (rounded) side of the seam and separate the two large COTYLEDONS. Cotyledon Embryo You should be able to see the tiny plant embryo and its parts- the embryonic root, embryonic stem and embryonic leaves.
    14. 14. Inside of a Lima Bean Hypocotyl Embryonic Stem Embryonic Leaves Embryonic Root) Seed coat
    15. 15. • Use a magnifying lens to locate and observe the embryo inside the seed. • Look for:  the two cotyledons,  the embryonic leaves,  the embryonic root  the embryonic stem
    16. 16. Cotyledon Embryonic Root Embryonic stem Inside a Lima Bean Seed Embryo leaves Cotyle
    17. 17. Lima Bean Seed Drawings Make sure you include the following: • • • • • Seed Coat (Testa) Cotyledon Embryonic Root Embryonic leaves embryonic stem
    18. 18. Inside of a Lima Bean Cotyledons •Embryonic Root •Embryonic stem •Embryonic leaves • Seed Coat (Testa)

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