BIOL211#4and#5(3)

BIOL211#4and#5(3) - Chapter 29 Ancestry and Diversity It is...

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1 Chapter 29 Plants and the Conquest of Land Ancestry and Diversity It is difficult to imagine the land without any plants A billion years ago Earth’s terrestrial surface was lifeless Since colonizing land, plants have diversified into roughly 290,000 living species Enabled other life forms to survive on land Figure 29.1 Researchers have identified green algae called charophyceans as the closest relatives of land plants Coleochaete sp. Chara sp. Complex charophyceans share several key traits with land plants – A distinctive type of cytokinesis – Intercellular connections known as plasmodesmata – Sexual reproduction by means of an egg and smaller sperm
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2 Distinctive features of land plants – Apical meristems – Alternation of generations – Maternally dependent embryos (matrotrophy) – Reproductive cells (spores) with tough walls – Specialized structures that generate, protect, and disperse reproductive cells Apical meristems Alternation of generations Maternally dependent embryos Walled spores in sporangia Multicellular gametangia
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3 Figure 29.1 Liverworts, mosses, and hornworts are Earth’s simplest land plants – Informally known as bryophytes – Nonvascular – Small – Common in moist habitats – Have a sporic life cycle Liverworts Mosses Hornworts Sporic life cycle Figure 29.6
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4 In the sporophyte haploid spores are produced within enclosures called sporangia Spores have cell walls containing
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This note was uploaded on 10/02/2011 for the course BIOL 211 taught by Professor Boury during the Spring '08 term at Iowa State.

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BIOL211#4and#5(3) - Chapter 29 Ancestry and Diversity It is...

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