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Question

Choose the correct option. 
  1. Annelids - Pseudocoelomates
  2. Platyhelminthes - Acoelomates 
  3. Aschelminthes - Acoelomates 
  4. Platyhelminthes - Coelomates


Solution

The correct option is B Platyhelminthes - Acoelomates 
Animals possessing coelom are called coelomates. In coelomates, the body cavity is lined by mesoderm. Example - annelids, molluscs, arthropods, echinoderms, hemichordates and chordates. 

In some animals, the body cavity is not lined by mesoderm, instead, the mesoderm is present as scattered pouches in between the ectoderm and endoderm. Such a body cavity is called pseudocoelom and the animals possessing them are called pseudocoelomates. Example - aschelminthes. 

The animals in which the body cavity is absent are called acoelomates. Example - platyhelminthes. 

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