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Question

The tube within tube plan is not present in ...........

A
Taenia
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B
Pheretima
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C
Leech
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D
Ascaris
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Solution

The correct option is C Leech
  • Tube within a tube plan is the development of a fluid-filled cavity between the outer body wall and the digestive tube.
  • It is seen in acoelomate, pseudocoelomate and coelomate animals.
A. Taenia is a genus of tapeworms which are acoelomates.
B. Pheretima is a genus of earthworms which are true coelomates.
C. Leeches are segmented worm-like animals belonging to the phylum Annelida which are schizocoelomates.
D. Ascaris is a genus of parasitic roundworms pseudocoelomates.
  • So, the correct answer is 'Leech'.

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