Evolutionary Past • Cyanobacteria • Blue- green algae • Photosynthetic • Responsible for the marked increase in Oxygen 2000 million years ago
Cyanobacteria Evidence • DNA shows the first green plants evolved from prokaryotes between 2500 and 1000 million years ago. • Same chlorophyll in algae and land plants.
Endosymbiosis • a symbiotic relationship between two organisms in which one of the two organisms (the endosymbiont) lives inside the body of the other one (the host).
Classification of Plants • Kingdom - Plantae • Division (-phyta) • Class (-opsida) • Subclass (-idae) • Order (-ales) • Family (-aceae) • Genus • Species (Genus + specific epithet)
Magnolia grandiflora • Plantae--includes all plants • Magnoliophyta--flowering plants • Magnoliopsida--dicots • Magnoliidae--subclass for Magnolia-like plants • Magnoliales--order for Magnolia-like plants • Magnoliaceae--family for Magnolia-like plants • Magnolia--genus that includes all Magnolias • grandiflora--specific epithet
Circumscription of Features • A new condition is added at each step to set up a category that is MOST specific. Example: • Things with wheels = buses, cars, bicycles, skates, airplanes, trains, etc. • And is ground transport = buses, cars, bicycles, trains • And can carry more than one person = buses, cars, trains • And runs on rails = trains http://www.csdl.tamu.edu/FLORA/tfplab/lab1a.htm#taxonomy
Four major lineages • Nonvascular – lack xylem & phloem & seeds • Seedless vascular – have xylem & phloem, lack seeds • Gymnosperms - have seeds, but not enclosed • Angiosperms - enclosed seeds
Examples Seedless Vascular Nonvascular Dicot Angiosperm Gymnosperm Monocot
Classes of Angiosperms • Monocotyledonae (Monocots) • Very few are annuals • Lilies, grasses, cattails, palms, yuccas, orchids, irises • Dicotyledonae (Dicots) • More primative, 1/6 are annuals • Almost all kinds of trees and shrubs • Snapdragons, mints, peas, sunflowers
Parts of the flower PISTIL • Stigma • Style • Ovary STAMEN • Anther • Filament becomes the fruit becomes the seed
Reproductive Organs Close up of stigma, style and anthers in a tulip
Works Cited –retrieved 5/16/06 • http://www.personal.psu.edu • http://www.biology.iastate.edu • http://www.emc.maricopa.edu • http://fybio.bio.usyd.edu.au • http://scitec.uwichill.edu • http://images.google.com/images • http://www.cas.vanderbilt.edu
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