Bio1b Summer 2008 Eric Harris Plants Lecture 3 Page 1 of 2 PLANTS LECTURE 3 FERNS GYMNOSPERMS Reading 7th ed 584 597 8th ed 610 625 A Evolution and Introduction to Vascular plants i Vascular system evolved 408 387 million years ago ii Changes in evolution of vascular plants includes the dominance of the sporophyte generation the evolution of the seed in gymnosperms creation of support structures and changes in the way gametes are transported B Seedless Vascular Plants a k a Ferns and fern allies a k a Pteridophytes i Diversity includes 12 000 species Major groups ferns lycophytes ii Fern life cycle 7th ed p 585 8th ed p 611 iii Heterospory vs homospory iv Extinct pteridophytes the coal forests C Vascular Plants with naked seeds a k a Gymnosperms i Diversity includes 8000 species Major groups conifers gingko cycads gnetophytes ii Important changes in the gymnosperm life cycle reduction in the gametophyte generation evolution of pollen evolution of the seed iii Pine life cycle 7th ed p 597 8th ed p 624 iv Terms related to life cycle microsporangia microspores megasporangia megaspores v The ovule megasporangium megaspore and integuments The seed a fertilized ovule Updated on 07 20 08 Bio1b Summer 2008 Eric Harris Plants Lecture 3 Page 2 of 2 Updated on 07 20 08
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