Question

Which flow chart correctly shows the sequence of movement of water in the sponge canal system?

• A. Spongocoel → Ostia → Osculum
• B. Ostia → Spongocoel → Osculum
• C. Osculum → Spongocoel → Ostia
• D. Ostia → Osculum → Spongocoel

Answer 1

The correct option is B

Ostia → Spongocoel → Osculum

Water enters the body of a sponge through dermal pores called ostia. The water from the ostia enters the central body cavity or the spongocoel. Spongocoel is lined by special type of cells called choanocytes. Choanocytes help in churning the water for capturing food, obtaining oxygen, and removing waste. Finally, the water moves out from the body through the osculum.