Unit 1-Lesson 9

Question 1

Name and describe the 2 body planes

Answer 1

• Radial Symmetry:
  
  • a body plan that can be divided along any plane, through a central axis, into roughly equal halves
• Bilateral Symmetry:
  
  • a body plan that can be divided into mirror halves only along one plane through the central axis

Question 1

List the characteristics that can be used to classify animal

Answer 1

• Symmetry and body planes
• Number of body layers
• Body cavity
• Segmentation
• Movement
• Reproduction

Question 2

What are Germ Layers?

Answer 2

layers of cells in a developing embryo that give rise to specialized tissues

Question 3

Name and describe the 2 body cavity

Answer 3

• Coelom: digestive tract and other organs suspended in a fluid-filled body cavity (Ex. molluscs, insects, vertebrates). Called coelomates
• Acoelomates: do not have a coelom (Ex. corals, jellyfish and flatworms)

Question 4

What is segmentation and what are the advantages of having segments on your body?

Answer 4

segmentation is the division of the body into repetitive sections, or segment
- Advantage:
- if one segment is damaged, the other segments can still function properly
- Also mobility is more effective because segments move independently

Question 5

What are the differences between a Vertebrates and Invertebrates?

Answer 5

• Vertebrates
  
  • animals with a dorsal backbone or notochord. Function to protect dorsal nerve chord.
  • Example: fish, amphibians, birds and mammals
• Invertebrates
  
  • all other animals without a backbone