Bio1b Summer 2008 Eric Harris Plants Lecture 2 Page 1 of 2 PLANTS LECTURE 2 ALGAE BRYOPHYTES Reading 7th ed 523 524 553 562 567 583 8th ed 516 517 580 589 590 592 600 610 A Algae i The origins of the chloroplast endosymbiosis ii Like the protists the traditional group of algae is a polyphyletic assemblage of evolutionarily disparate things including both unicellular plankton and multicellular seaweed organisms Main groups Unicellular 1 Bluegreen algae cyanobacteria a prokaryote 2 Dinoflagellates responsible for toxic red tides 3 Euglenoids flagellated single celled organisms 4 Diatoms important component of freshwater and marine plankton 5 Golden algae carotenoid pigments some colonial species Multicellular 6 Brown algae e g kelp 7 Red algae why is red algae red proximate phycoerythrin pigments and ultimate evolution in deep sea explanation 8 Green algae e g Ulva Introduction to the Alternation of Generations life cycle isomorphic alternation of generations iii Economic importance of Algae Updated on 07 20 08 Bio1b Summer 2008 Eric Harris Plants Lecture 2 Page 2 of 2 B Bryophytes i Move onto land 430 million years ago recall Paleozoic era ii Challenges of living on land dessication increased UV irradiation sunlight gravity wind iii Mechanisms for coping to living on land protection internal transport support iv The first land plants complex algae v The Bryophytes include mosses liverworts hornworts These are contemporary land plants that probably are the most similar to the first land plants vi Bryophyte life cycle main plant body is haploid gametophyte water is required for flagellated sperm cells to swim to the archegonium 7th ed p 581 8th ed p 607 vii Economic importance of bryophytes Updated on 07 20 08
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