Question

Choose the correct order of water pathway in sponges.

• A. Ostia $\to$ Spongocoel $\to$ Osculum
• B. Ostia $\to$ Osculum $\to$ Spongocoel
• C. Osculum $\to$ Ostia ​​​​​​​$\to$ Spongocoel
• D. Spongocoel $\to$ Ostia ​​​​​​​$\to$ Osculum

Answer 1

The correct option is A Ostia $\to$ Spongocoel $\to$ Osculum

Sponges belong to phylum Porifera. They have a water transport or canal system. Water enters through minute pores called ostia in the body wall into a central cavity, known as spongocoel, from where it goes out through the osculum. This pathway of water transport is helpful in food gathering, respiratory exchange and removal of waste. So, the correct sequence is

Ostia $\to$ Spongocoel $\to$ Osculum