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Unformatted text preview: Chapter 28:Plants Without Seeds, From Water to Land 28.1 How did the land plants arise? o Land plants are a monophyletic group with embryos o This leads to them beign called embryophytes o Streptophytes include land plants and some algae o Green plants refers to land plants and all algae o Ten major groups of plants o 7 out of 10 have vascular systems, they are called tracheophytes Because they all have fluid conducting cells called tracheids o Bryophytes lack tracheids nonvascular plants o The two groups of green algae that are closest to plants include the coechaetales and the charales both retain eggs in parental organism o Charales thought to be sister group of plants because of Plasmodesmata joining cytoplasm of adjacent cells Growth is branching and apical Similar perocisome contents Similar mechanics of mitosis, cytokinesis, and chloroplast structure o Chara lead to stoneworts coleochate leads to liverwort 28.2 How did land plants colonize and thrive on land? o The characteristics that distinguish land plants from algae are adaptations which include A waxy cuticle slows water loss Stomata small closable openings that are used to regulate gas exchange Gametangia multicellular organs that enclose and protect plant gametes Embryos young plants within protected structures Pigments which protect against harmful UV rays...
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- Summer '05