Lecture 13, Ch. 29

Lecture 13, Ch. 29 - Walled spores produced in sporangia...

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Lecture #13 Date _______ Lecture #13 Date _______ Chapter #29 ~ Plant Diversity I: The Colonization of Land
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Plant Evolution Plant Evolution bryophytes (mosses), pteridophytes (ferns), gymnosperms (pines and conifers); angiosperms (flowering plants) Plants : multicellular, eukaryotic, photosynthetic autotrophs Terrestrial colonization : Vascular tissue The seed The flower
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Plant origins Plant origins Charophytes : green algae (closest plant ancestor) Similarities: 1-Homologous chloroplasts: 2- Biochemical similarity cellulose composition; peroxisomes 3- Cell division similarity mitosis; cytokinesis 4- Sperm similarity ultrastructure 5- Genetic relationship nuclear genes; rRNA
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Characteristics that separate plants from algae ancestors Characteristics that separate plants from algae ancestors Apical meristems: localized regions of cell division Multicellular, dependent embryos (embryophytes) Alternation of generations
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Unformatted text preview: Walled spores produced in sporangia Multicellular gametangia Other terrestrial adaptations Other terrestrial adaptations Cuticle Stomata Xylem and phloem Secondary compounds Bryophytes Bryophytes Mosses, liverworts, and hornworts 1st to exhibit the embryonic condition (male = antheridium; female = archegonium) Flagellated (water) sperm No vascular tissue (imbibe water) No lignin (short stature) Haploid gametophyte is the dominant generation Pteridophytes: seedless vascular plants Pteridophytes: seedless vascular plants Ferns, club moss, horsetails True roots and leaves Roots have lignified vascular tissue Sporophyte-dominant life cycle Homosporous plants: a single type of spore. Sporophyte---->Single type of spore ---->Bisexual gametophyte ---->Eggs; sperm (flagellated; damp locations) Carboniferous period plants...
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Lecture 13, Ch. 29 - Walled spores produced in sporangia...

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