Question

Sponges belong to phylum Porifera because their bodies have

• A. Spicules in skeleton
• B. Several pores
• C. Canal system
• D. All of the above

Answer 1

The correct option is D All of the above

Sponges belong to phylum Porifera. There are calcium carbonate crystals in the body of the sponge which acts as the endoskeleton. They are known as sponges because they have a perforated body like a sponge. There is a water transport or canal system in which the water enters through ostia in the body wall into the spongocoel and then goes out through the osculum. This pathway is helpful in the circulation of the food, gas exchange and removal of waste.

Thus, the correct answer is option D.