Earthworm is characterized by (a) Presence of true coelom and metamerism (b) Presence of true coelom but the absence of metamerism (c) Absence of true coelom and metamerism (d) Absence of true coelom but the presence of metamerism
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Correct option b presence of neither true coelom nor metamerismExplanation: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 orgrans 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 es pseudocoel
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