BIO 121 Lecture Notes - Lecture 24: Sporophyte, Fern, Rhynia
10 Dec 2020
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Document Summary
About 360 to 300 mya carboniferous period. Although spores resist drying out and can last for long periods. Moss life cycle: haploid gametophyte is dominant over sporophyte diploid. Lignin in cells walls: strengthen stems: bright greens stain. Lignin and xylem furthered advanced vessel member. Leptoids and hydroids are a start; reproductive structures in land plants are well protected; spores dispersed in air. Moss and liverwort don"t have good pipes. Better pipes in vascular plants: number of which still only reproduce by spores. Make large, true leaves with vascular supply. True roots bring water into the plants. Evaporation in atmosphere due to solar energy. Water loss from plant (stomata in lamina) transpires. Water pulled through plant (rhizome, petiole: leaf stem) Homosporous: spores are all the same; aka: only one type of spore. It is a useful thing outbreeding: more potential for variety; bring a zygote of new variation. Produce wood (developed xylem cells) having even more structural support.
