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

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