plant diversity chapter 20. why are plants important? mm edicine ff ood cc onvert abiotic to biotic...

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Plant Diversity Chapter 20

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Plant Diversity

Chapter 20

Why are plants important? Medicine

Food

Convert abiotic to biotic

Create habitats

Modify the climate

Stabilize the soil

Cladogram for plants

What adaptations allowed plants to come on to land?

Pollen grain

Cuticle

Stomata

mycorrhizae

Vascular tissue

Xylem

phloem

Diversity of Plants

BryophytesMoss, liverworts, hornworts

First land plants

No true roots, stems, or leaves

Contain no vascular tissue

Rhizoids instead of roots

Gametophyte is the dominant generation

Require water for reproduction

FernsSpore Bearing Plants

Contains vascular tissueContains vascular tissue

Evolved 350 million years agoEvolved 350 million years ago

Live in moist, acidic environmentsLive in moist, acidic environments

Created coal depositsCreated coal deposits

Sporophyte dominant generationSporophyte dominant generation

Anatomy of a Fern

Fiddlehead a baby frond

Gymnospermsconifers, cycads, ginkgos

Most ancient of the seed plants

Seeds lack protective outer coating

Conifers- evergreens

Live in sandy soil, in a cool moist environment

Roots spread out over a large shallow area

Needlelike leaves covered with a thick waxy cuticle

AngiospermsThe Flowering

Plants

90% of all land plantsSeeds are enclosed inside a protective

fruit

Broken into two categories