Ascaris is characterized by

Options

A. absence of true coelom but presence of metamerism
B. presence of neither true coelom nor metamerism
C. presence of true coelom but absence of metamerism
D. presence of true coelom and metamerism (metamerisation)

Answer

B

Explanation

Ascaris is 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 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 as pseudocoel.