Download Chapter 20 Plant Diversity

Plant Diversity
Chapter 20
Medicine
Why are plants important?
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
Bryophytes
Moss, 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
Ferns
Spore Bearing
Plants
Contains vascular tissue
Evolved 350 million years ago
Live in moist, acidic environments
Created coal deposits
Sporophyte dominant generation
Anatomy of a Fern
Fiddlehead
a baby
frond
Gymnosperms
conifers, 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
Angiosperms
The Flowering Plants
90% of all land plants
Seeds are enclosed inside a
protective fruit
Broken into two categories