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R 23 - Growing Up - Reproduce(a lot needed here Rhynia The...

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10/28/2009 1 Tallest tree in the world Fact of the day Mountain ash or Tasmanian Oak - Eucalyptus regnans Hyperion Redwood - Sequoia sempivirens Tallest tree in the world Fact of the day Eucalyptus regnans 132 m (historical) 99.6 m (current) Giant Sequoia Blue Whale 32 m Lion’s mane jellyfish 115 m 87 m Mosses Mosses , , elsewhere
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10/28/2009 2 Mosses Stages of life-cycle in plants Sporophytes–make SPORES = a diploid(2N) that produces spore(N) Gametophytes –make GAMETES = a haploid(N) makes a gamete(N) (N) (2N) (2N) (2N) (=> N) (N) (N) (N) How to meet the challenge of the land Resist drying out/excess radiation Support mass against gravity Get and Transport nutrients/H2O to where needed Reproduce (a lot needed here) Mosses have a strategy to meet some of these needs
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10/28/2009 3 How to meet the challenge of the land Resist drying out/excess radiation Support mass against gravity Get and Transport nutrients/H2O to where needed Reproduce (a lot needed here)
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Unformatted text preview: Reproduce (a lot needed here)- Rhynia The most abundant material on earth after cellulose From Bet ina Selig, Gunil a Borgefors: ht p://www.cb.uu.se/ Lignin is bright green Lignin and Xylem are critical advances Eventually 10/28/2009 4 Ferns - (Vascular Plants) – make large (“true”) leaves with extensive vascular supply 10/28/2009 5 Gymnosperms 10/28/2009 6 Tree ferns Cycads How to meet the challenge of the land • Resist drying out/excess radiation • Support mass against gravity • Get and Transport nutrients/H2O to where needed • Reproduce (a lot needed here) Mosses and Ferns do have a strategy to meet some of these needs 10/28/2009 7 How to meet the challenge of the land • Resist drying out/excess radiation • Support mass against gravity • Get and Transport nutrients/H2O to where needed • Reproduce (a lot needed here) (2N) (N)...
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