Bryophyta

Beschreibung

A-Levels Biology a2/2 (KINGDOM PLANTAE) Mindmap am Bryophyta, erstellt von ZC_ am 11/05/2013.
ZC_
Mindmap von ZC_, aktualisiert more than 1 year ago
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Erstellt von ZC_ vor mehr als 11 Jahre
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Zusammenfassung der Ressource

Bryophyta
  1. Mosses
    1. Lacks true roots,stems and leaves
      1. Does not posses vascular tissue

        Anmerkungen:

        • reliance on turgor  remain relatively small
    2. Dominent phase

      Anmerkungen:

      • the dominent phase is the gametophyte.(haploid plant)
      1. GAMETOPHYTE
        1. Grows from a spore
      2. spore
        1. Protonema
          1. Gametophyte
            1. Leaf like structures
              1. One cell thick

                Anmerkungen:

                • only one cell thick to increase surface area for photosynthesis.
                1. supported by stem like structures
                  1. rhizoids act as anchors

                    Anmerkungen:

                    • a group of fine multicellular filaments often obtain water and mineral ions. however they are small so do not penetrate the soil deeply. mosses need to stay in damp areas.
                  2. lacks cuticule
                    1. require a moist enviroment
                    2. Gametangia develop
                      1. antheridia: sperm

                        Anmerkungen:

                        • sperm - antherozoids
                        1. archegonia: egg

                          Anmerkungen:

                          • egg - ova
                          1. sporophyte
                            1. develops from zygote

                              Anmerkungen:

                              • zygote - fertilised egg
                              1. consists of seta and sporangium
                                1. stalk and capsule
                                  1. contains spores
                                  2. totally dependent on gametophyte
                                    1. no free living sporophytes
                                      1. possesses a cuticle and stomata
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