Presentation on theme: "Ch 29/30 - The Making of a Land Plant I. The Problems of being a “land” plantland In Water (the easy life)On Land (the hard life)Land Plant Adaptations."— Presentation transcript:
Ch 29/30 - The Making of a Land Plant I. The Problems of being a “land” plantland In Water (the easy life)On Land (the hard life)Land Plant Adaptations 1. Supportive 1. Non-Supportive Cell walls with lignin, xylem, stems, turgor 2. Retains water 2. Lose waterVascular tissueVascular tissue, roots, cuticle, stomata 3. Reproduction easy 3. Reproduction hard a. Sperm swim in water b. Dispersal easy (float) c. Eggs will not dry out a. Sperm can not fly b. Young not dispersed c. Embryos need protection Pollen, flowers, fruit, sporopollenin, seed coats, protected embryo II. The Characteristics of Land Plant A. Growth at tips - apical meristemsapical meristems B.Multicellular with dependent embryos retained in female part of plant “embryophytes”“embryophytes” 1. Placental transfer cells (higher plants) 2. Foot (Lower plants) C. Walled spores made in sporangia composed of sporopollenin D. Multicelluar gametangia (antheridia & archegonia)(antheridia & archegonia) E. Alternation of Generation Multicellular sporophytes makes spores that grow into a multicellular gametopyte that makes gametes
Fern Gametophyte with Developing Sporophyte Archegonium Antheridium Rhizoids (Why are they called “rhizoids” and not roots) Slide 3
Lycopodium Gametophyte Slide 3
Slide 3 Whisk Fern Gametophtye Why is it brown and not green?
What is the difference between a spore and a seed? Spores Seed 1.Unicellular 1. Multicellular 2.Haploid 2. Diploid 3.Asexual reproduction 3. Sexual reproduction 4.First cell of gametophyte 4. Part of the Sporophyte generation 5. Formed by meiosis (usually) 5. Formed by fertilization after mitosis Slide 1