gymnosperms

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Author:
efrain12
ID:
147072
Filename:
gymnosperms
Updated:
2012-04-11 17:42:45
Tags:
botany
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Description:
botany
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  1. 2 groups of vascular plants
    -seedless/spore

    -seeds
  2. ferns
    -seedless

    -homosporous

    -true leaves or megaphylls
  3. fern allies
    club mosses, spike mosses, horsetails

    -heterospores (2 types of spores)

    -small leaves with one vein or microphylls
  4. Gymnosperms
    ex) pines, etc.

    • -seeds (ovules)
    • -no fruit (ovary)
    • -cones

    "naked seeds"
  5. 4 phyla of gymnosperms
    1) phyla pinophyta

    2) Phyla Cycadophyta

    3) Phyla Gynkophyta

    4) Phyla Gnetophyta
  6. Phyla Pinophyta
    • -cones
    • -needle-like leaves
    • -"evergreen"
    • -seed, but no fruit

    ex) red cedar, redwood
  7. Phyla Cycadophyta
    cycad

    • -cones
    • -leaves fern-like
    • -flagellated sperm in pollen
    • -tropical
  8. Phyla Ginkohyte
    ginko

    • -fan shaped leaves
    • *desidious: all fall same time
    • -female cone looks like freshy "fruit"
    • -only one species left "gynko bibolia
  9. Phyla Gnetophyta
    -male and female plants

    -vessels, as well as tracheids

    -dont look like "evergreen"
  10. traits of gymnosperms
    • -vascular tissue
    • -seeds
    • -cones, in most
    • -sporophyte generation
    • -gameophyte generation
  11. (traits of gymnosperms) vascular tissue
    • a) xylem- tracheids
    • *more primitive than vessels

    b) phloem- sieve tube cells
  12. (traits of gymnosperms) seeds
    ovules
  13. (traits of gymnosperms) Cones (mega and microphylls)
    -male (pollen) cones

    -female (seed) cones
  14. Megaphylls
    small and male
  15. Microphylls
    larger and female
  16. (cones) Male (pollen) cones
    (staminate)

    • -small
    • -in clusters
    • -papery
    • -pollen inside the pollen sacs
  17. (cones) Female (seeds) cones
    (pistallate)

    • -larger
    • -1-2 woody cones (when mature)
    • -seed on scale of cone
  18. Sporophyte plant of pine
    -dominant

    -what you see
  19. Gametophyte generation
    • -dependent on sporophyte plant
    • -very small
    • -not photosynthetic
    • - has a female and male gametophyte plant
  20. (gametophyte generation) Male gametophyte plant
    -pollen

    -only has 2 cells

    -"wings carried by wind to fertilize

    -contain sperm nuclei (no flagella)

    -does not require water to fertilize
  21. Female gametophyte plant
    • -100 plus cells big
    • -remains inside ovule
    • -forms 1-2 archegonia
    • -egg inside archegonia

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