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