evolution_land_plants-1

evolution_land_plants-1 - The Plant Kingdom: Seedless...

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The Plant Kingdom: Seedless Plants   Chapter 27
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What did the environment look like? hat known plants were potential invaders ? Green algae @ 1.6 bya Red algae @ 1.6 bya Brown algae @ 500 mya Mars with water > Plankton unicells? What would progenitors look like? Roots? Stems? Leaves? Flowers? Pollen? Land… the first frontier
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land plants evolve Earliest algae Precambrian (1.6 bya) I I nvaded land, nvaded land, 490 mya 490 mya Kingdom Protista
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Learning Objective 1 What are some environmental  challenges of living on land? How do some plant adaptations meet  these challenges?
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The Conquest of the Land Selection for Life on Land Water is a stable environment What  selective pressures  would favor  algae that could live on land? Probably  competition Nutrients Light  (shading) maybe the most critical Space
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The Conquest of the Land The invasion of the land is really the  invasion of the  air Adaptations are really adaptations for life  in the relatively drier atmosphere
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Life on Land:  Solving the  Problems Desiccation Algae have to be in contact with water to  avoid drying out Plant cell protoplasm is surrounded by cell  wall made of cellulose Mechanical strength and protection Cellulose is very hydrophilic Like a sponge Absorbs water easily Loses water easily to dry substrate or  atmosphere
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Life on Land:  Solving the  Problems Desiccation Cuticle Waxy water-proof coating on  outside of cell wall Water can’t get in or out Stomata For gas exchange needed for  photosynthesis
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Life on Land:  Solving the  Problems Water for sexual reproduction Gradual reduction in size of gametophyte   generation No motile gametes  in seed plants No need for water
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evolution_land_plants-1 - The Plant Kingdom: Seedless...

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