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  • Planaria, Liver fluke and Tapeworm areOption: 1 All segmentedOption: 2 All found in the gut

Planaria, Liver fluke and Tapeworm are

Option: 1

All segmented


Option: 2

All found in the gut


Option: 3

All coelomates


Option: 4

All triploblastic


Answers (1)

best_answer

 

 

Reproduction and Development in Platyhelminthes -

  • The platyhelminthes are hermaphroditic animals.
  • The male and female sex organs are present in the same animal. 
  • Fertilization is internal and development is indirect. 
  • Many larval stages are formed before an adult is produced. 
  • Bladder Worm (cysticercus) is the larval stage seen in Tapeworm
  • Some animals, like Planaria, show high capacity of regeneration. 
  • Therefore, asexual reproduction occurs through regeneration. 
     

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Platyhelminthes are triploblastic animals, i.e., the embryo shows the arrangement of three germ layers as ectoderm, mesoderm and endoderm. These are acoelomate. The space between ectoderm and endoderm is filled with mesodermal tissue called parenchyma. They show bilateral symmetry. They are the first animals to show a degree of cephalization.  They show organ level of body organization. They are mostly parasitic. Some free-living forms are aquatic.

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Kuldeep Maurya

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