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Evolutionary Study of Plants

Evolutionary Study of Plants. 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.

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Evolutionary Study of Plants

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  1. Evolutionary Study of Plants www.assignmentpoint.com

  2. Evolutionary Past • Cyanobacteria • Blue- green algae • Photosynthetic • Responsible for the marked increase in Oxygen 2000 million years ago www.assignmentpoint.com

  3. 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. www.assignmentpoint.com

  4. 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). www.assignmentpoint.com

  5. Classification of Plants • Kingdom - Plantae • Division (-phyta) • Class (-opsida) • Subclass (-idae) • Order (-ales) • Family (-aceae) • Genus • Species (Genus + specific epithet) www.assignmentpoint.com

  6. 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 www.assignmentpoint.com

  7. 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 www.assignmentpoint.com

  8. Four major lineages • Nonvascular – lack xylem & phloem & seeds • Seedless vascular – have xylem & phloem, lack seeds • Gymnosperms - have seeds, but not enclosed • Angiosperms - enclosed seeds www.assignmentpoint.com

  9. Examples Seedless Vascular Nonvascular Dicot Angiosperm Gymnosperm Monocot www.assignmentpoint.com

  10. Nonvascular lifecycle www.assignmentpoint.com

  11. Seedless vascular lifecycle www.assignmentpoint.com

  12. Gymnosperm lifecycle www.assignmentpoint.com

  13. Angiosperm lifecycle www.assignmentpoint.com

  14. 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 www.assignmentpoint.com

  15. Monocot characteristics www.assignmentpoint.com

  16. Dicot characteristics www.assignmentpoint.com

  17. Parts of the flower PISTIL • Stigma • Style • Ovary STAMEN • Anther • Filament becomes the fruit becomes the seed www.assignmentpoint.com

  18. Reproductive Organs Close up of stigma, style and anthers in a tulip www.assignmentpoint.com

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