Chapter21Sum07

Chapter21Sum07 - Plant Evolution Plant Evolution Chapter 21...

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Plant Evolution A Plant Evolution Chapter 21 How have plants adapted to live on land?
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Plants evolved from multicellular green algae Nonvascular Plants Seedless Vascular Plants Seed Plants Flowering Plants
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Possible mechanism for how multicellular green algae evolved into plants: 1. Some multicellular green algae lived at lake fringes. 2. Occasionally they dried out, so those that could survive without constant water were “naturally selected”. 3. Bright sunlight was limitless (not filtered by water) 4. Likely no plant-eating animals as predators.
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PLANT LEAF- performs photosynthesis CUTICLE- reduces water loss STOMATA allow gas exchange STEM- supports plant (and may perform photosynthesis) Surrounding water supports the alga ALGA WHOLE ALGA performs photosynthesis; absorbs water, CO 2 , and minerals from the water HOLDFAST anchors the alga ROOTS anchor plant; absorb water and minerals from the soil aided by symbiotic fungi (mycorrhizae)
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Cross-section of a stem: vascular system Figure 17.1x1 Xylem Phloem
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1. Chloroplasts 2. Same photosynthetic pigments as plants 3. Cellulose cell walls 4. Starch as food storage 5. Alternation of generations (haploid; diploid) 6. Cell plate formation during mitosis Multicellular Green Algae: live in water . They are NOT plants but they share these similarities with all plants:
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Bryophytes - Nonvascular Small, nonvascular, nonwoody Gametophyte dominates life cycle; has leaflike, stemlike, and rootlike
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Chapter21Sum07 - Plant Evolution Plant Evolution Chapter 21...

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