BIOL 1105 Lecture Notes - Lecture 6: Vascular Plant, Green Algae, Tracheid
Document Summary
Green plant phylogeny: green algae and land plants share a common ancestor and are called green plants, all green plants are photoautotrophs but not all photoautotrophs are green plants. Major challenges to terrestrial life revolve around the availability of water. Plants living in water have easy access and are protected: desiccation. Tracheophytes: they could colonize due to efficient vascular tissues, xylem is for water conduction, phloem is for conducting sucrose, hormones, and organic compounds, tracheophytes can grow larger due to a vast transport system. It has a waxy cuticle: stomata, sporophyte dominant. Lycophytes: possess vascular tissue, roots and stems, the produce no seed, water is needed for fertilization, sporophyte dominant. Pterophytes: ferns: sporophyte dominant, water is needed for fertilization, no seeds, vascular tissue is the roots, stems, true leaves (euphylls and have large surface area) It protects embryos and stores food and has a large period of dormancy.