BIOL-Q 201 Lecture 6: Q201_Lecture6
Document Summary
Plants: characteristics of plants o eukaryotes o multicellular o *carry out photosynthesis to obtain energy. Cell walls are composed of cellulose: bryophytes: mosses, liverworts, and hornworts o earliest land plants (475 million years ago) o characteristics of bryophytes. 3 o diploid: contain two copies of each gene and chromosome: vascular plants: the earliest vascular plants o originated 425 million years ago o characteristics of the earliest vascular plants. The first vascular plants were seedless: lycophytes: club mosses, firmosses, and spike mosses, pterophytes: ferns and horsetails, characteristics of ferns o vascular tissues: xylem, phloem, and rigid stems o true roots o microphylls: pigments used in photosynthesis o sori and spores (on undersides of leaves) No seeds o reproduction: alternation of generations: vascular plants with seeds o seeds contain a plant embryo plus food for the embryo, within a protected coat o two major groups of seed plants: