Question

Porifera has

• A. Water vascular system
• B. Canal system
• C. Haemo coelomic system
• D. None of the above

Answer 1

Answer: (B)

Canal system

The body of the sponge is traversed by numerous canals opening to the outside by many minute pores. These canals and pores of the sponge constitute the canal system. Following types of canal systems are found in sponges-

1. Ascon type, with flagellated spongocoel.

2. Sycon type, with flagellated radial canals.

3. Leucon type, with flagellated chambers.

4. Rhagon type, with conical shape and broad base.

So, the correct answer is option B.