01:119:116 Lecture Notes - Lecture 3: Lycopodiopsida, Gametangium, Sporophyll
5 May 2015
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Document Summary
Plants are in domain euka-3rd group in archaeaplastida. A. characteristics of charophytes that enabled move to land: Edges of ponds and lakes: subject to occasional drying. Nat sel favors survival for periods without being submerged. Group of microtubules: forms btw daughter nuclei during cell division. Cell plate-forms in middle of phragmoplast gives rise to new cross walls that separate daughter cells. 5 key traits appear in nearby all land plants but are absent in the cahrophytes: Is haploid and produces haploid gametes by mitosis b. diploid sporophyte: The diploid embryo is retained within the tissue of the female gametophyte. Nutrients are transferred from parent to embryo through placental transfer cells. Land plants are called embryophytes coz of the dependency of the embryo on the parent. Sporocytes= diploid cells in sporangia: undergo meiosis to produce haploid spores. Spores= haploid reproductive cells mitosis grow into multicellular gametophytes. Spore walls contain sporopollenin makes them resistant to harsh env.
