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Chapter 25: What Is an Animal?

Practice Test
      
  1.The layer of cells on the outer surface of the gastrula is called the __________.  
  a.   endoderm  
  b.   dermis  
  c.   ectoderm  
  d.   mesoderm  
  Hint    
      
  2.The cell layer that forms during development and eventually becomes the lining of the animal`s digestive tract is the __________.  
  a.   dermis  
  b.   ectoderm  
  c.   mesoderm  
  d.   endoderm  
  Hint    
      
  3.The cell layer that forms during development and eventually becomes the skin and nervous tissues of the animal is the __________.  
  a.   dermis  
  b.   ectoderm  
  c.   endoderm  
  d.   mesoderm  
  Hint    
      
  4.In acoelomate animals, such as flatworms, organs are located ________.  
  a.   in solid body tissues  
  b.   in the coelom  
  c.   in the pseudocoelom  
  d.   in the fluid-filled body cavity lined with mesoderm  
  Hint    
      
  5.The development of body cavities made it possible for animals to __________.  
  a.   respond to stimuli  
  b.   get oxygen more effectively  
  c.   stay small  
  d.   grow larger and move more efficiently  
  Hint    
      
  6.A skeleton inside the body of an animal is called a(n) __________.  
  a.   endoskeleton  
  b.   exoskeleton  
  c.   vertebrate  
  d.   mesoskeleton  
  Hint    
      
  7.The evolution of the coelom made it possible for animals to __________.  
  a.   become land animals  
  b.   have space for complex internal organs  
  c.   become more adapted to their way of life  
  d.   become larger and thicker in body shape  
  Hint    
      
  8.A type of skeleton that can help to prevent water loss and provide protection is called a(n) ___________.  
  a.   vertebrate  
  b.   exoskeleton  
  c.   endoskeleton  
  d.   mesoskeleton  
  Hint    
      
  9.The heart and blood vessels in a dog develop from the __________.  
  a.   ectoderm  
  b.   protostome  
  c.   mesoderm  
  d.   endoderm  
  Hint    
      
  10.An organism that can be divided vertically into similar right and left halves that form mirror images of one another is said to have __________.  
  a.   total symmetry  
  b.   bilateral symmetry  
  c.   asymmetry  
  d.   radial symmetry  
  Hint    
      
  11.Structures that act as a kind of watery skeleton against which muscles can work are called the _________.  
  a.   acoelom and pseudocoelom  
  b.   coelom and pseudocoelom  
  c.   acoelom and coelom  
  d.   coelom and mesoderm  
  Hint    
      
  12.During development, the cells on the side of the blastula fold inward to produce a __________.  
  a.   zygote  
  b.   gastrula  
  c.   mesoderm  
  d.   fertilized egg  
  Hint    
      
  13.The evolution of the pseudocoelom made it possible for animals to __________.  
  a.   become more adapted to their way of life  
  b.   have space for complex internal organs  
  c.   move more efficiently  
  d.   become land animals  
  Hint    
      
  14.Animals such as earthworms digest food in a ________.  
  a.   gizzard  
  b.   pseudocoelom  
  c.   gastrula  
  d.   digestive tract  
  Hint    
      
  15.A body cavity completely surrounded by mesoderm is called a __________.  
  a.   coelom  
  b.   blastula  
  c.   gastrula  
  d.   protosome  
  Hint    

 
   
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