Plants Lifecycle www.assignmentpoint.com

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

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 www.assignmentpoint.com

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

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

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

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

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

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

Nonvascular lifecycle www.assignmentpoint.com

Seedless vascular lifecycle www.assignmentpoint.com

Gymnosperm lifecycle www.assignmentpoint.com

Angiosperm lifecycle www.assignmentpoint.com

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

Monocot characteristics www.assignmentpoint.com

Dicot characteristics www.assignmentpoint.com

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

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