Question

Distinguish between the following by giving one main point: Coelenteron and spongocoel.

Answer 1

S.No.	Coelenterons	Spongocoel
(i)	In Cnidarians, the body enclose coelen- teron cavity, hence the name coelen- terata is given to this phylum.	In sponges, the body wall encloses a large cavity called spongo-coel.
(ii)	Coelenterons has only one aperture mouth.Anus is absent. Coelenteron is lined by gastrodermis. E.g., Hydra, Aurelia, Physalia, Adamsia, Pennatula etc.	Spongocoel is lined by flagellated choanocytes. Water current enter through dermal ostia (pores) and after passing through spongocoel, water goes out by osculum. E.g., sponges like Scypha, Euplectella, Leucosolenia.