07-11-08

07-11-08 - Ch.30 Gymnosperm A. Gymnosperms bare...

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Ch.30 Gymnosperm A. Gymnosperms bare “naked” seeds typically on cones a. Gymnosperms include…(fig 30.4) B. Gymnosperm Evolution a. Fossils revel that by the late Devonian plants called progymnosperms had some characteristics of seed plants b. Gymnosperms dominated the Mesozoic terrestrial ecosystems i. Known as the age of the Cycads ii. Also the end of the dinosaurs C. A closer look at the life cycle of a gymnosperm a. Key features of the gymnosperm life include i. Dominance of sporophytes generation ii. The role of pollen in transferring sperm to ovules 1. No water required iii. The development of seeds from fertilized ovules ***3 generations are represented in the seed of a gymnosperm*** D. Concept 30.3: The reproductive adaptations of angiosperms include flowers and fruit a. Angiosperms aka flowering plants i. “covered seeds” b. Derived traits are the reproductive structures called flowers and fruits c. The most widespread and diverse of all the plants i. 250,000 species ii. 90% of all extant plant species
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07-11-08 - Ch.30 Gymnosperm A. Gymnosperms bare...

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