Plants 2

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Slide 1

Plants

Slide 2

Evolutionary Past

Cyanobacteria

Blue- green algae

Photosynthetic

Responsible for the marked increase in Oxygen 2000 million years ago

Slide 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.

Slide 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).

Slide 5

Classification of Plants

Kingdom - Plantae

Division (-phyta)

Class (-opsida)

Subclass (-idae)

Order (-ales)

Family (-aceae)

Genus

Species (Genus + specific epithet)

Slide 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

Slide 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

Slide 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

Slide 9

Seedless Vascular

Examples

Monocot

Dicot

Nonvascular

Gymnosperm

Angiosperm

Slide 10

Nonvascular lifecycle

Slide 11

Seedless vascular lifecycle