3.31.06 L68 - Lecture 68 Plant Evolution Advantages of...

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March 31, 2006 Lecture 68: Plant Evolution  Advantages of Living in the Ocean Three major functional tissues Dessication Dispersal Protection of sensitive stages Issues and Solutions No multicellular 2N stage o Alternation of Generations Dipersion Zygote used for dispersion, mainly goes dormant in the mud. What if we used spores instead of zygotes to disperse? Make a sporophyte to make more spores? Needs protection and food—an archegonium The archegonium is an adaptation to protect the vulnerable stage in the sporophyte Also note, hermaphrodites avoid the dispersion problem. Um…its dry—really dry o Cuticle OK, so now that we got them out, how do we protect them? o Sporopollenin (waxy coat)  This is how we went from algae to plant Vulnerable Stages Reduce the gametophyte stage The archegonium protects sporophyte Vascular Tissues
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  • Summer '07
  • GILBERT,C.
  • RNA, Evolution, Fern, sporophyte Vascular Tissues

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