bio notes 2-13

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bio notes 2-13
2012-03-13 13:20:02
bio notes

bio notes
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  1. what are the clades of seedless vascular plants?
    club mosses, whisk ferns, ferns, horsetails
  2. which clade has microphylls (simple scale-like leaves)?
    club mosses
  3. what is another name for horse tails?
    scouring rush
  4. which clade has reduced megaphylls that form whorls, impregnated with silica
  5. which clade has reduced or no megaphylls
    whisk ferns
  6. which clade has large megaphylls with branching vascular strands that emerge as fiddleheads?
    leptosporangiante ferns
  7. describe sporangia in leptosporangian ferns?
    found in clusters (sori), have thin walls (only 1 cell thick), protected by an indusium
  8. what is an application of seedless vascular plants?
    club moss spores used as flash powder
  9. what is a word for "living today"?
  10. what does the xylem in gnetophytes and angiosperms contain?
    tracheids and sometimes vessel elements
  11. What are some advantages of secondary growth?
    provide support to grow taller, helps light absorption and seed dispersal
  12. what are some characteristics of seed plants?
    sperm no longer swims to egg, have vascular tissue, secondary growth, gametes are greatly reduced, heterosporus, have seeds
  13. what 2 types of spores are developed by meiosis?
    microspore(n), megaspore (n)
  14. what develops into a tiny microgametophyte (pollen grain) that produces 2 sperm by mitosis
  15. what develops into a microscopic megagametophyte that produces 1 egg by mitosis?
  16. what are the 3 generations of seeds?
    seed coat, nutritive tissue, and embryo
  17. what is derived from the integument of the parent sprophyte?
    seed coat
  18. what generatoin is derived from the female gametophyte?
    nutritive tissue
  19. what generation is the new sporophyte?
  20. what are some advantanges of seeds?
    protection, dispersal, nourishment, extended period of dormancy,