Question

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

Answer: (D)

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.