Ch 29/30 - The Making of a Land Plant I. The Problems of being a “ land ” plant 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 water Vascular 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 The Characteristics of Land Plant A. Growth at tips - apical meristems B. Multicellular with dependent embryos retained in female part of plant “embryophytes” 1. Placental transfer cells (higher plants) 2. Foot (Lower plants) C. Walled spores made in sporangia composed of sporopo llenin D. Multicelluar gametangia (antheridia & archegonia) E. Alternation of Generation Multicellular sporophytes makes spores that grow into a multicellular gametopyte that makes gametes
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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.
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Ch 29/30 - The Making of a Land PlantI. The Problems of being a “land” plant
In Water (the easy life) On Land (the hard life) Land Plant Adaptations