Question

Osculum occurs in

• A. Star Fish
• B. Ray Fish
• C. Hydra
• D. Sponge

Answer 1

The correct option is D Sponge

A. Star fish belongs to phylum Echinodermata.

B. Ray Fish belongs to phylum Chordata.

C. Hydra belongs to phylum Cnidaria.

D. Sponge belongs to phylum Porifera.

Osculum is an exhalant pore present in members of phylum Porifera only i.e. sponges. Water enters the body of sponges through ostia and leaves through osculum.

So, the correct answer is 'Sponge'.