Question

A chamber common to all types of canal system of sponges is

• A. Paragastric cavity
• B. Radial chamber
• C. Excurrent canal
• D. Incurrent canal

Answer 1

The correct option is A Paragastric cavity

• Animals of phylum Porifera, commonly called sponges, characteristically have a water transport or canal system.
• The canal system in sponges is of three types - asconoid, syconoid, and leuconoid.
  
• Depending on the complexity of the canal system, these canal systems are present in different types of sponges but all poriferans have a paragastric cavity or spongocoel.
• However, radial canals, excurrent canals, and incurrent canals are not present in all the sponges.
  

Hence, the correct option is A.