Transcript Plant Lab Ppt

Chapter 12: Diversification of the
Plants
Where did all the plants and fungi come from?
Lectures by Mark Manteuffel, St. Louis Community College; Clicker Questions by Kristen Curran, University of Wisconsin, Whitewater
Moss
4 Major Plant Phyla
Bryophytes
12.2 Colonizing land brings new
opportunities and challenges for plants.
A life cycle of alternating
haploid and diploid
generations in which the
diploid embryo is
protected by the haploid
female
Moss: Alteration of Generation
12.3 Mosses and other non-vascular plants
lack vessels for transporting nutrients and
water.
The
Bryophytes
include:
mosses,
liverworts, and
hornworts
12.4 The evolution of vascular tissue
made larger plants possible.
Like a circulatory
system, vessels are an
effective way to carry
water and nutrients up
from the soil to the
leaves.
Ferns
Now the sporophyte
generation (diploid adult)
dominates: is more
conspicuous, is present for a
longer period of time in the life
cycle, and is responsible for
photosynthesis.
Ferns: Alteration of Generation
Gymnosperms
Conifers
12.6 With the evolution of the seed,
gymnosperms became the dominant plants
on Earth.
Now the sporophyte
generation is even more
dominant.
The gametophytes are
smaller but are still
multicellular.
Angiosperms
Flowering Plants
95 % of the world’s plants are Angiosperms,
which diversified with the mass extinction of the
dinosaurs.
12.8 Angiosperms are the dominant
plants today.
Angiosperm
reproduction
more closely
resembles
the life cycle
of animals: a
diploid adult
and haploid
gametes.
12.11 Fleshy fruits are bribes that
flowering plants pay animals to
disperse seeds.
Monocot
• Grains (wheat, corn, rice, millet), lilies,
daffodils, sugarcane, banana, palm,
ginger, onions, bamboo, sugar, cone, palm
tree, banana tree, and grass are examples
of plants that are monocots.
Dicot
• Legumes (pea, beans, lentils, peanuts),
daisies, mint, lettuce, tomato and oak are
examples of dicots.
Stems
Root
Root