BIO 121 Chapter 29: Chapter 29 and 30- Plants.docx
Document Summary
Land plants evolved from green algae- evidence: algae and plants are both: multicellular, eukaryotic, photosynthetic autotrophs, charophytes: closest living algae to land plants based on dna and rna. Adaptations allowing plants to move to land out on land. Plant life cycle: gametophyte fertilization sporophyte meiosis. Diploid sporophytes undergo meiosis to make haploid spores that develop into gametophytes which make gametes. Derived traits of plants that make them different from charophytes and algae: alternation of generations (between gametophytes and sporophytes. Life cycle consists of multicellular haploid gametophytes and diploid sporophytes. Gametophytes: haploid plants that produce eggs and sperm through mitosis. Sporophytes: diploid plant that develops from mitosis of the zygote that produces spores (reproductive cells that can develop into a new haploid gametophytes). Gametangia: sex organs where gametes are produced in gametophytes. Antheridia: male reproductive organ: multicellular, dependent embryos, walled spores produced in sporangia.
