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14 Cards in this Set

  • Front
  • Back
land plants evolved from
green algae
- carophytes: share several traits with land plants.
four key features that most land plants share
1. alternation of generations
2. spores produced in sporangia
3. multicellular gametangia
4. apical meristems
alternation of generations
- alternate between multicellular diploid (gametophyte) for and multicellular haploid (sporophyte).
spores produced in sporangia
- sporangia: where spores are produced. a sac like structure.
multicellular gametangia
- archegonia: gametangia that produces eggs
- antheridium: gametangia that produces sperm
apical meristems
- where growth occurs in plants
two categories of land plants
- vascular (seedless and with seeds) and nonvascular
mosses (phylum bryophtyta)
- non vascular
- waxy cuticle
- stomata
- dominant gametophyte
- no roots
- flagellated sperm
ecological importance of mosses
- retain essential nutrients
- prevents erosion.
- heat source (peat)
ferns (phylum pterophyta)
- vascular tissue
- seedless
- roots and leaves.
- dominant sporophyte
- flagellated sperm
vascular tissue
- xylem- tracheids contain lignin (for support)
- phloem - food conducting.
sporophylls
- specialized sporangia bearing leaves.
- led to parts of flower.
- homosporous or heterosporous spore production.
heterospory
- megasporangium produce megaspores - eggs
- microsporangium produce microspores - sperm
significance of ferns
- dropped atmospheric CO2 which led to global cooling.
- eventually became peat, then coal.