Life Cycle And History of Plants

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Presentation transcript:

Life Cycle And History of Plants 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

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

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

History of Plants Plants Aquatic Green Algae

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

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

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