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Chapter 22.1

Chapter 22.1. Life Cycle And History of Plants. 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.

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Chapter 22.1

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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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