1 / 14

Seed Plants: The Dominant Vegetation

Seed Plants: The Dominant Vegetation. Chapter 29. Evolutionary History. 360million years ago Appearance of a thick woody stem Leading to xylem Progymnosperms – 1 st vascular plants. http://www.ucmp.berkeley.edu/seedplants/progymnosperms.html. Two main groups today. Gymnosperms (pines)

auryon
Download Presentation

Seed Plants: The Dominant Vegetation

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Seed Plants: The Dominant Vegetation Chapter 29

  2. Evolutionary History • 360million years ago • Appearance of a thick woody stem • Leading to xylem • Progymnosperms – 1st vascular plants http://www.ucmp.berkeley.edu/seedplants/progymnosperms.html

  3. Two main groups today • Gymnosperms (pines) • Angiosperms (flowering plants)

  4. Common characteristics • Sporophyte is the plant (2n) • Gametophyte (n) are the male and female structures. • Xylem and phloem • No water necessary for fertilization http://www.eplantscience.com/botanical_biotechnology_biology_chemistry/plant_life_cycles.php

  5. Gymnosperms • “Naked seeds” • Cone producers • Cycads, ginkos, conifers

  6. Gymnosperms http://biology.clc.uc.edu/courses/bio106/gymnospr.htm

  7. Angiosperms

  8. gametophyte • Ovule- (megagametophyte) egg develops into seed • The pollen grains (microgameotphyte) are the sperm

  9. Angiosperm success • Fertilization within the ovule • Double fertilization, two nuclei, • Second nuclei creates the endosperm to nourish the embryo http://www.biosci.ohio-state.edu/~plantbio/osu_pcmb/pcmb_lab_resources/pcmb300lamb_au2010/03-15_SeedStructures.html

  10. Angiosperm success • Have flowers and fruits • Complex phloem • Ovule and seeds enclosed, protected by carpels

  11. Life cycle of angiosperms • http://www.exploringnature.org/db/detail.php?dbID=94&detID=2195

  12. Important terms 2 main angiosperm clades: • Monocots • Single embryonic cotyledon • Corn seed • Dicots (eudicots) • Two cotyledons • Bean seed

  13. Plants are important • Ecosystem services • Primary producers • Source of medicine http://www.duke.edu/web/soc142/team3/Group%20Rice/History.htm

  14. References • Sadava, Hillis, Heller, Berenbaum. 2010. Life the Science of Biology. WHFreeman and Co., Gordonsville, VA

More Related