LIFE 103 1st Edition Lecture 7Outline of Last Lecture I. A summary of life II. Context of LifeI. Numbers and figures III. Derived traits of land plants I. Alternation of generationsII. SporesIII. Gametangia IV. Linear growth i. All absent or lost in common ancestorIV. Haploid vs. Diploid V. Key termsI. GametophyteII. Sporophyte VI. Nonvascular plants I. Liverworts II. HornwortsIII. MossesOutline of Current Lecture I. MossesI. Anatomy II. SequenceIII. Ecology II. Ferns and other seedless plants I. Anatomy II. Other derived traitsIII. Diversity Current Lecture: Seedless Land Plants Moss AnatomyI. Antheridia (“flowery” + “small one”)I. Structure that releases spermII. Archegonium (“begin” + “procreation”)I. Structure produces and houses egg & zygote III. Mature sporophytes grow atop female gametophytesThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.IV. Fig. 29.9d I. Polytrichum commune, hairy-cap moss II. Where is meiosis happening? Sporophyte cap III. Capsule and seta = sporophyteV. Fig. 29.8.1 I. Mosses can’t have sex without water II. Gametophyte is biggerdominant life stage Moss Ecology I. Wetland moss genum Sphagnum is especially widespreadII. Sphagnum decay in wetlands is very slow, so wetlands accumulate dead Sphagnum tissues III. Storage of carbon in Sphagnum wetlands affects global temperature by reducing the amount of CO2 in the atmosphere Ferns and other Seedless Plants I. Life cycleI. AnatomyII. SequenceII. Other derived traitsI. Vascular transportIII. Diversity Fern AnatomyI. Life cycle dominated by sporophyte (diploid) II. Mature gametophyte (haploid) releases both eggs and sperm I. Sperm released from (antheridia) II. Eggs released from (Archegonium) III. Spots on underside of fern leavesI. Sorus (plural = sori) II. Sorus = collection of sporangia III. Sporangia = capsule containing haploid spores IV. Fig. 29.13.1 Derived traits of Seedless Vascular Plants I. Reduced importance of gametophyteI. Gametophyte becomes even more reduced in seed plants II. Vascular tissuesI. Conduct water through xylem, transport sugars in phloemII. Xylem is strengthened by compound “lignin”III. Rigid xylem tissues allow for tall growthSeedless Plant Phyla I. Lycophyta (“wolf” + “plant”)I. Club “mosses”, spike “mosses”, and quillwortsII. Important phylum 300 million years ago III. Explosive spores – check out “lycopodium spores” on YouTube II. Pterophyta (“wing” + “plant”) I. Ferns, horsetails, and whisk ferns II. Fig. 29.15 picture of a horsetail, whisk fern III. Whisk fern yellow things are the tiny bumps Clicker question: In mosses the dominant life stage is the gametophyte, while in ferns it is the
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