Evolution of seed plants

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Biological Diversity - evolution of seed plants

  • 2n sporophyte - n spores - gametophyte - gametes - fertilization - 2n sporophyte etc
  • spores were - same size (homospory)
  • different sizes, spores formed within - same sporangium 
  • 2 sizes, spore - different sporangia (heterospory)
  • large spores = megaspores, produced - megasporangium 
  • small spores = microspores, produced - microsporangium
  • megaspores normally - female gametophytes
  • microspores normally - male gametophytes
  • fewer megaspores produced - sporangium 
  • megaspores retained - megasporangium. contain food store
  • protective layer (integument) formed around megaspore - ovule
  • megaspores - ovules
  • microspores - pollen grains
  • fertilized ovule…

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