BIO 203 Lecture Notes - Lecture 28: Welwitschia, Caffeine, Meiosis
1 Dec 2016
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Plants: all descendants of the eukaryote that co-evolved with a cyanobacterium to produce the plastid (chloroplast) Increased complexity of vegetative body structures: true leaves, roots and vascular tissue in vascular plants, wood and drought-adapted leaves in gymnosperms, great diversity among the angiosperms. Increasing diversity of body type: all small, low-growing in non-vascular plants, small tree = max size in seedless vascular plants, shrubs to trees in gymnosperms, all types in angiosperms. Increasing diversity of habitats (cid:523)(cid:498)amphibious(cid:499)(cid:524: non-vascular plants limited to at least seasonally wet environments, seedless vascular plants less limited, greatest diversity of gymnosperms in dry or cold environments, angiosperms flourish under all conditions. Seed plants also stick to heterospory, producing distinct types of spores that produce male or female structures (slide #14) Sporophyte is nutritionally dependent on the gametophyte. More upright growth form than other non-vascular plants. Sphangnum moss (also called peat moss) is used extensively used by humans. Still extant, and still functional organisms are not (cid:498)living fossils(cid:499)
