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Question
CBSEENBI12002699
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Ascaris is characterised by 

  • the absence of true coelom but the presence of metamerism

  • the presence of neither true coelom nor metamerism

  • the presence of true coelom but the absence of metamerism

  • the presence of true coelom and metamerism (memorisation) 

Solution

B.

the presence of neither true coelom nor metamerism

Ascaris is an endoparasite of man. It inhabits the small intestine more frequently of children than of adults. the body is elongate, cylindrical and gradually tapering at both ends. There is no metameric segmentation. In Ascaris between the body wall and Visceral organs is a spacious fluid filled cavity. This cavity is not true coelom as it is not lined by coelomic epithelium, has no relation with reproductive and excretory organs and develops from blastocoel. This body cavity is referred pseudocoel.

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