BIO-1802 Lecture Notes - Lecture 13: Ephedra, Cycad, Pinophyta
4 Mar 2017
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Document Summary
Plants: angiosperms (cid:862)vessel seeds(cid:863) flowering plants ovary flowers attract pollinators with petals and fruit helps disperse seeds seed develops from the ovule. Examples of gymnosperms: phylum cycadophyte: cycads. Wood: growing tall, trees (xylem tissue, aka, vascular tissue) Lignin: chemical on the cells walls (secondary cell walls) Attraction of pollinators fruit (cid:862) ago pal(cid:373)(cid:863) not actually a palm. Male cones, female leafy things plants have neurotoxins in them. Still have flagella on sperm (lots: phylum ginkgophyta: ginkgo biloba; (cid:862)(cid:373)aide(cid:374) hair tree(cid:863) Almost went extinct-found in monastery in china (cid:862)livi(cid:374)g fossil(cid:863) Nothing attacks it anymore males often plants because females smell awful. Male cones and female fleshy (the integument) seeds, smelly dioceous. Used to be almost everywhere (millions of years ago: phylem pinophyta: pines, spruces, firs. Really well adapted to cold, dry, environments. Hemlocks currently being attacked by invasive pest. Some of the oldest living trees about 5000 years old; some 10000 years old.
