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.

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

Nonvascular lifecycle

Seedless vascular lifecycle

Gymnosperm lifecycle

Angiosperm lifecycle

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

Monocot characteristics

Dicot characteristics

Parts of the flower

PISTIL Stigma Style OvarySTAMEN Anther Filament

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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