Question

Molluscs are

• A. schizocoelomates
• B. pseudocoelomates
• C. enterocoelomates
• D. acoelomates

Answer 1

The correct option is A schizocoelomates

The coelom is a cavity present between the body wall and gut wall and is lined with mesoderm. It is of two types - schizocoeleom and enterocoelom. Schizocoelom is the true coelom formed by the splitting of mesoderm. Enterocoelom is formed from the pouches pinched off from the gut (enteron).

Annelids, arthropods and molluscs are schizocoelomates.
Echinoderms, hemichordates and chordates are enterocoelomates.
Animals belonging to Platyhelminthes are acoelomates as there is no coelom.
Animals belonging to Aschelminthes are pseudocoelomates and the coelom is not lined by mesoderm, instead, the mesoderm is scattered as pouches in between the body wall and gut wall.