GYMNOSPERMS

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rice2am
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264673
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GYMNOSPERMS
Updated:
2014-03-02 15:05:58
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GYMNOSPERMS
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GYMNOSPERMS
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  1. lignophytes
    woody plants
  2. woody plant derived features
    • vascular cambium
    • cork cambium
  3. vascular cambium
    gives rise to secondary xylem (wood) and phloem
  4. cork cambium
    gives rise to periderm (including cork)
  5. spermatophytes
    • seed plants
    • monophyletic group within the lignophytes
    • eustele
  6. seed
    • embryo surrounded by nutritive tissue and a seed coat
    • provides protection adn nutrients to developing embryos during their formation and germination
  7. seed evolution
    • heterospory (two types of spores)
    • endospory
    • reduction of megaspore numner to one
    • retention of megaspore within megasporangium instead of released
    • evolution of integument
  8. endospory
    development of gametophyte within a spore wall
  9. integument
    outer layer of ovules
  10. pollen grain
    immature, endosporic male gametophyte
  11. male gametophyte not considered mature until
    pollen tube has formed
  12. siphonogamy
    process of the formation of the pollen tube
  13. seed adaptation
    • providing protection to the embryo
    • acting as dispersal units
    • dormancy
    • nutritive tissue to the embryo
  14. progymnosperms
    • extinct
    • reproduced by freely dispersed spores, yet had wood similar to that of living conifers
    • secondary phloem
    • Archeopteris
  15. Archeopteris
    progymnosperm
  16. Pteridosperms
    • seed ferns
    • primitive seed-bearing plants with fernlike leaves
  17. gymnosperms
    • naked seed
    • ovules are exposed to air (seeds not in fruit)
    • A OVULIFEROUS SCALE
    • B MEGASPOROCYTE
    • C INTEGUMENT
    • D MICROPYLE
    • E STERILE BRACT
  18. ABIES
  19. CHAMAECYPARIS
  20. CRYPTOMERIA
  21. CUNNINGHAMIA
  22. CUPRESSUS
  23. cycas
  24. EPHEDRA
  25. EPHEDRA
  26. FEMALE GINKGO
  27. GNETUM
  28. GNETUM
  29. JUNIPERUS
  30. LARIX
  31. LARIX
  32. LARIX
  33. microsporangiate strobilus
  34. microsporangiate strobilus
  35. Ovules in pairs on stalks at tips of spur shoots
  36. PICEA
  37. PODOCARPUS
  38. SEQUOIA
  39. TAXODIUM
  40. TAXUS
  41. THUJA
  42. TSUGA
  43. WELWITSCHIA
  44. WELWITSCHIA

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