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  • Which of the following has metamerically segmented body?Option: 1 EarthwormOption: 2 Leech<

Which of the following has metamerically segmented body?

Option: 1

Earthworm


Option: 2

Leech


Option: 3

Nereis


Option: 4

All of these


Answers (1)

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Phylum Annelida:

  • The term ‘Annelida’ is derived from the latin term annellus, that implies small rings. This phylum contains the animals that are also called ‘Ringworms’.
  • The body of annelids is truly segmented because these segments or metameres are externally visible as annuli and internally as septation. 
  • Segmentation improves the movement and enhances the chances of survival by providing redundancy.
  • They are triploblastic and bilaterally symmetrical. 
  • They have a true coelom, i.e., they are coelomate. The mesoderm lines the cavity on both sides. 

 

 

The body of annelids is truly segmented because these segments or metameres are externally visible as annuli and internally as septation.

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SANGALDEEP SINGH

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