Ch 27 - Colonization of the land

Ch 27 - Colonization of the land - The Plant Kingdom:...

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The Plant Kingdom: Seedless Plants (Colonization of the Land) Chapter 27 Colonization of Land by Plants Required anatomical, physiological, and reproductive adaptations Waxy cuticle protects against water loss Thinner for those in moister habitats Stomata (tiny pores) for gas exchange needed for photosynthesis Multicellular gametangia and embryos Charophytes Historically, plants probably arose from charophytes (stoneworts) An ancient group of green algae Water habitat; complex ancestors Based on molecular comparisons of DNA and RNA sequences close match between charophytes and plants on chloroplast DNA, nuclear genes and rRNA sequences Plant Evolution Alternation of Generations Two divisions to the plant life cycle haploid (n) gametophyte generation gives rise to haploid gametes by mitosis diploid (2n) sporophyte generation. Two haploid gametes fuse to form a zygote; sporophyte (2n) produces haploid (n) spores by meiosis, the start of the gametophyte generation Basic Plant Life Cycle Gametangia Most plants have multicellular gametangia
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This note was uploaded on 02/11/2010 for the course BIO 01-119-10 taught by Professor D'arville during the Spring '09 term at Rutgers.

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Ch 27 - Colonization of the land - The Plant Kingdom:...

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