13 - BIO LECTURE NOTES (2/4/09) Diversification of green...

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Unformatted text preview: BIO LECTURE NOTES (2/4/09) Diversification of green plants Evolutionary sequence observed in water-conducting cells o A) Simple water conducting cells Little structural support. Found in fossils o B) First vascular tissue Lignin provides substantial structural support Some structural support. Found in fossils o C) Tracheids Increased structural support. Found in all vascular plants Primary wall and secondary wall Ends have gaps in secondary cell wall (inside) o D) Vessel elements Found in gnetophytes and angiosperms Ends have gaps through primary and secondary wall cells Primary wall and secondary wall How do plants reproduce in dry conditions? o Adaptations for efficient plant reproduction in a dry environment Spores that resist drying Gametes that were produced in complex, multicultural structures gametangia Embryos that were retained on the parent plant and were nourished by it embyrophytes Land plant reproductive structures o Early land plants contained specialized reproductive organs called gametania that protected gametes from drying and damage o Individuals produce distinctive male and female gametangia :...
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This note was uploaded on 11/16/2009 for the course BIOL BIOL taught by Professor Johnson during the Spring '08 term at Aberystwyth University.

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13 - BIO LECTURE NOTES (2/4/09) Diversification of green...

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