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  •  Which of the following groups possesses the notochord either throughout or at any stage of their life cycles? Option: 1  Hemichordate

 Which of the following groups possesses the notochord either throughout or at any stage of their life cycles? 

Option: 1

 Hemichordates 


Option: 2

 Sponges 


Option: 3

 Platyhelminthes


Option: 4

 coelenterates 


Answers (1)

best_answer

 

 

 

Notochord: 

  • It is the rod-like cartilaginous structure that is present dorsally during the development of embryos in animals. 
  • It is derived from the mesoderm. 
  • Those animals that do not possess notochord at any stage of their life cycles are called non-chordates. They are also called invertebrates. For example, sponges, coelenterates, Platyhelminthes etc.
  • Those animals that possess the notochord either throughout or at any stage of their life cycles are called chordates. For example, hemichordates, urochordates etc.
  • In some chordates, the notochord is replaced by a bony vertebral column. Such animals are called vertebrates. For example, mammals.

 Sponges, Platyhelminthes and coelenterates do not possess notochord at any stage of their lives. 

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Riya

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