Feathered Dinosaurs

5 Questions | Total Attempts: 33

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Feathered Dinosaurs

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Questions and Answers
  • 1. 
    Living birds and extinct non-avian theropod dinosaurs share many derived traits, including
    • A. 

      An ankle that forms between the tarsal and and tibia+fibula.

    • B. 

      Solid bones.

    • C. 

      A furcula (wishbone) formed by fusion of clavicles.

    • D. 

      An unfused, cartilaginous sternum.

    • E. 

      Short, immobile neck.

  • 2. 
    Archaeopteryx lithographica, found in Germany in 1861, was the first fossil bird to be described. While this ancient animal had a toothed beak, wing claws and a long tail with many vertebrae, it also had
    • A. 

      A fused tibia and fibula.

    • B. 

      Gill slits.

    • C. 

      An anapsid skull.

    • D. 

      Four wings.

    • E. 

      Structurally modern feathers.

  • 3. 
    Structures preserved in ancient feathers have been treated as evidence of pigmentation. These pigmentation structures are called
    • A. 

      Carotosomes.

    • B. 

      Keratosomes.

    • C. 

      Melanosomes.

    • D. 

      Oligosomes.

    • E. 

      Zoosomes.

  • 4. 
    The ‘tree-down’ (arborial) hypothesis for the origin of flight in birds proposes that “Ancestors of birds ran along ground and eventually began to jump and leap. Wings (and feathers) developed to extend their ability to leap by aiding in propulsion and balance, leading eventually to flight”
    • A. 

      True

    • B. 

      False

  • 5. 
    The bird wing is a classic example of homology among tetrapods. Other tetrapods may use an outstretched forelimb to assist with gliding, if not wing-powered flight. Examples of aerial gliding tetrapods occur in the following clades (choose all correct options).
    • A. 

      Mammalia.

    • B. 

      Batrachomorpha.

    • C. 

      Archosauria.

    • D. 

      Serpentes.

    • E. 

      Urodela.