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  • The three germ layers ­ ectoderm, mesoderm and endoderm are found inOption: 1 Chordates onlyOption:

The three germ layers ­ ectoderm, mesoderm and endoderm are found in

Option: 1

Chordates only


Option: 2

Chordates except protochordates


Option: 3

All the chordates and higher invertebrates


Option: 4

Higher chordates and higher invertebrates


Answers (1)

best_answer

 

 

Phylum Chordata -

The phylum chordata is characterized by the following:

Notochord: 

  • The name ‘Chordata’ is based on the presence of notochord at some stage or throughout the life cycle. 
  • It is a rod-like structure placed dorsally between the alimentary canal and nerve cord. 
  • It is derived from the mesoderm. 
  • In vertebrates, it is present during the embryonic development. 
  • It is then replaced by the vertebral column (spine) in the postnatal stage.

Dorsal Hollow Nerve Cord: 

  • It is placed dorsally to the notochord. 
  • It is hollow rod and is derived from the ectoderm. 
  • It develops into the brain and spinal cord and forms the central nervous system.

Pharyngeal Gill Slits: 

  • These are the openings present in the pharynx. 
  • They allow the entry and exit of water in aquatic animals. 
  • In vertebrate fishes, these develop into gills. In tetrapods, these are modified into tonsils and components of ears. 

Post-anal Tail: 

  • It is the posterior elongation of the body that goes beyond the anus. 
  • It consists of skeletal elements and muscles. 
  • It helps in locomotion in fishes and in balancing, courting etc. in terrestrial vertebrates. 
  • In is reduced and non-functional in man.

 

-

 

 

Higher invertebrates like Platyhelminthes, aschelminthes, annelids, arthropods, molluscs, echinoderms and all chordates are triploblastic.

Posted by

Shailly goel

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