Bio1331 Animals - Evolution - Ecdysozoans (Lecture Five)

15 Questions | Total Attempts: 52

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Bio1331 Animals - Evolution - Ecdysozoans (Lecture Five)

Questions and Answers
  • 1. 
    Complete the following sentence:One of the key features of the ecdysozoans is the ___________, a tough, non-cellular, secreted body covering.
  • 2. 
    Complete the following sentence:For an ecdysozoan to grow, the cuticle must be _____ and replaced with a larger one.
  • 3. 
    Approximately when did moulting evolve?
    • A. 

      >500 million years ago

    • B. 

      >5 million years ago

    • C. 

      >5 billion years ago

    • D. 

      >500 thousand years ago

  • 4. 
    True or False?Ecdysozoans had a single common ancestor.
    • A. 


    • B. 


  • 5. 
    Complete the following sentence:________ is a term meaning the moulting of the cuticle to enable growth.
  • 6. 
    The Nematodes are a clade of Ecdysozoans.Tick everything below that this group of organisms are/have.
    • A. 

      Bilaterally symmetrical

    • B. 

      Radially symmetrical

    • C. 


    • D. 


    • E. 


    • F. 


    • G. 

      Thick, multi-layered cuticle

    • H. 

      Thinly layered cuticle

    • I. 


    • J. 


    • K. 


  • 7. 
    The second clade of Ecdysozoans taught in the lectures are the most dominant animals on the Earth, accounting for at least 75% of described species and found in nearly all habitats on the planet.Name this species.
  • 8. 
    Please fill answer below_______
  • 9. 
    Complete the following sentence:________ were an early arthropod, with simple and repetitive body segmentation and appendages.
  • 10. 
    The substance that composes the exoskeleton is leathery in its pure form, but becomes harder when encrusted with calcium carbonate.It is found within the endocuticle of the exoskeleton.Name this substance.
  • 11. 
    Complete the following sentence:Some arthropod joints contain a substance called _______, which stores energy on compression and releases it efficiently, allowing them to jump.
  • 12. 
    True or False?Butterflies were the first insects to fly.
    • A. 


    • B. 


  • 13. 
    Complete the following:Insects have many adaptations to gas exchange.One of these adaptions is the _________, external openings on the thorax and abdomen. These can be closed to regulate water loss.
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