lecture 13
Download
Skip this Video
Download Presentation
Lecture 13

Loading in 2 Seconds...

play fullscreen
1 / 25

Lecture 13 - PowerPoint PPT Presentation


  • 262 Views
  • Uploaded on

Lecture 13. February 21, 2002 Chapter 18 The Evolution of Animal Diversity Chapter 31 Plants. Learning Objectives (1 of 2). Define Class Aves Class Mammalia List: The reptile-like characters of Archaeopteryx Recite: 2 pieces of evidence that birds evolved from reptiles

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Lecture 13' - Anita


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
lecture 13

Lecture 13

February 21, 2002

Chapter 18 The Evolution of Animal Diversity

Chapter 31 Plants

learning objectives 1 of 2
Learning Objectives (1 of 2)
  • Define
    • Class Aves
    • Class Mammalia
  • List:
    • The reptile-like characters of Archaeopteryx
  • Recite:
    • 2 pieces of evidence that birds evolved from reptiles
    • 3 basic types of mammals
learning objectives 2 of 2
Learning Objectives (2 of 2)
  • Recall:
    • The species of General Sherman
  • Contrast
    • Monocots and Dicots
    • Xylem and phloem
reptiles
Reptiles
  • Evolved from amphibians
  • Can live on land for entire life
  • 2 Major features:
    • Developed “amniotic land egg” to do this
      • No longer require water for reproduction
    • Water-proof skin
      • To conserve water
bird evolution
Bird Evolution
  • Believed to have evolved from small, carnivorous dinosaurs
    • Dino hand bones similar to bird wing bones
    • When given certain hormones, chicken embryos will develop teeth!
archaeopteryx
Archaeopteryx
  • A very early bird!
  • Reptilian characteristics
    • Long tail
    • Wing claws
    • Teeth
    • Scales on feet
class aves
Class Aves
  • All birds:
    • Have feathers!
    • Are endothermic (warm-blooded)
    • Lay eggs
class mammalia
Class Mammalia
  • All mammals:
    • Have fur (yes, even whales & dolphins)
    • Feed their offspring milk
    • Are endothermic
three basic kinds of mammals
Three Basic Kinds of Mammals
  • Monotremes:
    • They lay eggs!
    • Include platypus
  • Marsupials:
    • Carry young in pouch
    • Ex: kangaroos, opposums
  • Eutherians (placentals):
    • Longer pregnancy
    • More developed young
question
Question
  • Which group evolved earliest in the history of life?
    • Fish
    • Dinosaurs
    • Mammals
    • Birds
another question
Another Question
  • Are birds animals?
  • Are fish animals?
world s biggest plant
World’s Biggest Plant
  • The General Sherman Tree
    • Species is Sequoiadendron gigantea
    • Central California
    • 2500 years old!!!
    • National Park Service site
    • US Geological Survey site
angiosperms
Angiosperms
  • These are flowering plants
  • Two basic types:
    • Monocots
    • Dicots
monocots
Monocots
  • Have one “seed leaf”
  • Root network very fibrous
  • Leaves have parallel veins
  • Examples: orchids, bamboos, palms, grasses (including rice, other grains)
dicots
Dicots
  • Have two “seed leaves”
  • One main taproot plus root hairs
  • Leaves have multiply branched veins
  • Ex: trees, shrubs, carrots
question21
Question:
  • Where would we classify pine trees?
answer
Answer:
  • Trick question: they aren’t angiosperms
  • They’re gymnosperms (no flowers!)
xylem
Xylem
  • Contains water-conducting cells
  • Carries water and nutrients toward the leaves
phloem
Phloem
  • Contains food conducting cells
  • Transports sugars to tissues, roots
ad