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  • Notochord is present throughout the life inOption: 1 Fish  Option: 2 Leech<br /

Notochord is present throughout the life in

Option: 1

Fish
 


Option: 2

Leech
 


Option: 3

Amphioxus
 


Option: 4

Amphibia


Answers (1)

best_answer

 

 

 

Notochord: 

  • It is the rod-like cartilaginous structure which is present dorsally during the development of embryo 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 the 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.

 

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Posted by

Ritika Harsh

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