12-3Sseed plants_Lecture 37

12-3Sseed plants_Lecture 37 - Seed Plants Gymnosperms...

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5/10/11 Seed Plants Gymnosperms Angiosperms (flowering plants) Plants deal with the world through chemistry: Secondary metabolites aid in reproduction & defense; particularly diverse in seed plants; explains why plants are useful to humans as sources of medicine,
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5/10/11 Terpenes & terpenoids e.g. taxol, rubber Phenolics e.g. lignin, antioxidants Alkaloids (N) affect animal
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5/10/11 Modern gymnosperms (naked seeds—not in a fruit) Examples: cycads, conifers Cycad coralloid roots have Symbiotic cyanobacteria that fix nitrogen but also produce a neurotoxin that pervades the cycad plant causes dementia in people who eat flour made from cycad seeds or meat of animals that have fed on them.
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5/10/11 Conifers (cone-bearers) are the most diverse modern gymnosperms Dominate high altitude/latitude habitats. Lumber, turpentine, resins, etc.
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5/10/11 Common conifer adaptations to high altitudes/latitudes: Scale- or needle-shaped leaves Often evergreen; fast spring start Snow-shedding shape Wind- or animal-dispersed seeds
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This note was uploaded on 05/10/2011 for the course BIO 103 taught by Professor Geek during the Spring '11 term at Wisconsin.

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12-3Sseed plants_Lecture 37 - Seed Plants Gymnosperms...

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