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The Life Cycle and Evolutionary History of Plants

This chapter explores the intricate life cycle of plants, emphasizing the alternation of generations between haploid (N) and diploid (2N) phases. The dominant phase varies across different plant phyla, including gametophytes and sporophytes. It traces the evolutionary relationships among key groups such as bryophytes, pterophytes, gymnosperms, and angiosperms. Delve into the history of plants from aquatic green algae to modern flowering species, highlighting the significance of vascular tissue, seeds, flowers, and fruit in adaptation to dry land.

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The Life Cycle and Evolutionary History of Plants

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  1. Chapter 22.1 Life Cycle And History of Plants

  2. Plant Life Cycle • Alternation of Generation • Between haploid (N) and diploid (2N) phase • Between Gametophyte (N) and Sporophyte (2N) plants • One phase must be dominant • The dominant phase changes with the different plant phyla

  3. Alternation of Generation Spores (N) Sporophyte plant (2N) Gametophyte plant (N) Sperm (N) Fertilization Egg (N)

  4. History of Plants • What is the evolutionary relationship between… • Bryophytes • Pterophytes • Gymnosperms • Angiosperms

  5. History of Plants Plants Aquatic Green Algae

  6. History of Plants Flowering Plants Cone-bearers Ferns Mosses Aquatic Green Algae Flowers & Fruit Seeds Vascular Tissue Dry Land SIMPLE COMPLEX

  7. 235,000 species (90%) 15,600 (5%) 11,000 (4%) 760 (1%) Flowering Plants Mosses Ferns Cone-bearing Modern Plants

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