Question

Q. Ascaris is characterized by
A presence of true coelom but absence of metamerism
B presence of true coelom and metamerism (metamerisation)
C absence of true coelom but presence of metamerism
(D) presence of neither true coelom nor metamerism.

Answer 1

Solution:
Ascaris belong to the phylum Nematoda of super phylum Aschelminthes. They have a cylindrical body without showing any metamerism, a pseudocoel (false coelom) and a complete digestive tract lined by endodermal epithelium. The cuticle covering the body surface bears minute transverse striations giving a pseudosegmented appearance to the worm.