PLANT STUDY GUIDE BIO 240 W

PLANT STUDY GUIDE BIO 240 W - PLANT STUDY GUIDE BIO 240 W...

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PLANT STUDY GUIDE BIO 240 W I. Plant Diversity I: The Conquest of Land a. Plastid i. Photosynthetic organelle derived from endosymbiosis ii. Endosymbiosis between heterotroph and cyanobacterial autotroph b. Green algae i. Unicellular ii. Aquatic iii. Descendants gave rise to land plants c. Move to land i. Why? 1. photons 2. CO2 3. minerals 4. less herbivores d. Land life problems i. Water loss ii. Water transport iii. Support against gravity e. Evolution of land plants i. Adaptations for 1. water retention 2. water transport 3. structural support ii. intermediates 1. lineages of land plants f. Bryophytes i. Earliest diverging lineage ii. No vascular tissue (no long distance water transport) iii. Little structural support (not tall) iv. Mobile sperm (free water is required; moist environment needed) v. NO SEEDS 1. spores used for a. dispersal b. reproduction g. Seed i. Self contained embryo ii. Big food stock h. Spore i. Single dormant cell ii. Enclosed in hard case i. Seedless vascular plants i. Specialized tissues for long distance water transport ii. Xylem
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1. conducts water/minerals up from ground toward apex/leaves 2. reinforced by lignin a. rigid polymer b. lignified xylem=GREAT STRUCTURAL SUPPORT iii. phloem 1. conducts sugars from source to “sink” tissues
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PLANT STUDY GUIDE BIO 240 W - PLANT STUDY GUIDE BIO 240 W...

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