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tracheophytes

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Presentation2

  1. 1. Tracheophytes
  2. 2. General Information <ul><li>Greek ‘ trachea ’ = windpipe, </li></ul><ul><li>‘ phyta ’ = plant). Phylum Tracheaphyta. These are vascular plants. </li></ul><ul><li>Vascularization adaptation has allowed tracheophytes to become more fully terrestrial than bryophytes, </li></ul><ul><li>characterized by the presence of vascular tissue, composed of specialized conductive cells that create &quot;tubes&quot; through which materials can flow throughout the plant body </li></ul><ul><li>vascular tissues also provide a measure of support to the plant </li></ul>
  3. 3. <ul><li>The (2) two types of vascular tissue </li></ul><ul><li>* xylem (dead cells) and </li></ul><ul><li>* phloem (living cells) </li></ul><ul><li>the roots contain vascular bundles composed of xylem and phloem. </li></ul><ul><li>The roots draw water and minerals from the soil and pass them upward to the stem and leaves. </li></ul><ul><li>They are also responsible for storing the plant's organic nutrients , which are passed downward from the leaves through the phloem. </li></ul>
  4. 4. <ul><li>Tracheophytes can be broken down into three classes : </li></ul><ul><li>Ferns </li></ul><ul><li>gymnosperms </li></ul><ul><li>angiosperms. </li></ul>
  5. 5. Fossils evidence suggests that some groups formed dominant flora in the past. Today ferns are prominent in some cool, moist areas. - direct descendants of earliest land plants; fossils of their relatives are 410 million years old (late Silurian period) - Terrestrial or epiphytic - instead of roots have rhizomes (underground stems with many rhizoids) - forked stems with very simple vascular tissue - spore cases form at tips of short branchs - only two genera known
  6. 6. Club mosses (e.g. Huperzia species) (previously known as Lycopodium species) - prostrate, branching stem with upright branches - simple vascular systems - spore-bearing leaves arranged in cones in some species - motile sperm (male gametes)                      
  7. 8. Ferns - rhizomes (underground stem), roots and leaves - vascular tissue grouped in strands (bundles) - leaves bear spores in sporangia - gametophyte is heart-shaped, small, green and completely independent - motile sperm
  8. 9. Vascular plants with seeds Groups include: • primitive seeds ferns (now extict) - e.g. Glossopteris and Gangamopteris • flowering plants - monocotyledons and dicotyledons • cycads • Ginkgo biloba • conifers Seed ferns (e.g. Glossopteris )
  9. 10. extinct, but many fossils found, particularly in the Permian coal measures of NSW and Qld - fern-like appearance Cycads (e.g. Macrozamia various species) - separate male and female cones - motile sperm Ginkgo biloba
  10. 11. - cultivated around Chinese and Japanese temples - once thought extinct in the wild but since discovered in remote regions of western China - fan-shaped leaves - separate male and female trees
  11. 12. - most have true cones - pollinated by wind - naked seeds - i.e. not surrounded by ovary wall - source of economically important timber - e.g. pine species, Western Red Cedar, Oregan and Australian native cypress pine Conifers
  12. 13. Flowering plants (angiosperms) - complex vascular tissue - dominate land vegetation except coniferous forests - great variation in form - shrubs, trees, climbers; woody and non-woody - structurally adapted to land habitats of great diversity, but also aquatic - pollinated by animals - e.g. insects, birds and mammals - as well as wind and water - flowers have stamens (male sex organs) and carpels (female sex organs) - seeds within a closed structure (fruit) - economically important
  13. 14. (e.g. grasses, palms) • have one seed leaf (cotyledon) • leaves narrow with parallel veins • vascular bundles scattered Monocotyledons
  14. 15. ( e.g. daisy, eucalypts) • have two seeds leaves (cotyledons) • marked netted veins • flower parts in fours or fives • vascular bundles arranged in cylinders Dicotyledons
  15. 16. Fungi Fungi lack chlorophyll and so are unable to make their own food. They are either saprophytes , which live off dead plants and animals, or parasites , which live off plants and animals. PLANT-RELATED ORGANISMS
  16. 17. Lichens are very unusual in that they are made of two organisms - an alga and a fungus - living together in a mutually beneficial or symbiotic relationship. Lichens are the first conspicuous organisms to colonise bare rock surfaces. Lichens
  17. 18. Comparison of the three major groups of land plants:
  18. 19. <ul><li>Land plant divisions form three groups based on major morphological attributes: </li></ul><ul><li>Bryophytes </li></ul><ul><li>Pteridophytes </li></ul><ul><li>seed plants </li></ul><ul><li>The characteristics of these groups are compared in the following chart. </li></ul>
  19. 20. Groups include: • fork ferns (Psilopsids) • club mosses (Lycopods) • horsetails • ferns

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