First land plants - PowerPoint PPT Presentation

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First land plants

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  1. haploid diploid First land plants • Bryophytes: mosses & liverworts • non-vascular • no water transport system • no true roots • swimming sperm • flagellated sperm • lifecycle dominated by haploid gametophyte stage • fuzzy moss plant you are familiar with is haploid • spores for reproduction • haploid cells which sprout to form gametophyte Where mustmosses live?

  2. Bryophytes: mosses & liverworts

  3. Peat Bog “Peat Moss”

  4. diploid haploid First vascular plants • Pteridophytes: ferns • vascular • water transport system • xylem, phloem, roots, leaves • swimming sperm • flagellated sperm • life cycle dominated by sporophyte stage • leafy fern plant you are familiar with is diploid • fragile independent gametophyte (prothallus) • spores for reproduction • haploid cells which sprout to form gametophyte Where mustferns live?

  5. Pteridophytes: Ferns Selaginella Psilotum Horsetails Ferns

  6. Alternation of generations • Fern gametophyte (1n) • small haploid plant which produces gametes • homospory: male & female on same plant archegonia antheridia

  7. Alternation of generations diploid produces male & female gametes haploid archegonia antheridia

  8. Early Pteridophytes: Tree Ferns Fossil fuels… I get it! Carboniferous forest – 290-350 mya Forests of seedless plants decayed into deposits of coal & oil

  9. Pteridophytes: Tree ferns fronds fiddleheads With frondslike these who needs enemies!