Water Canal System

Q. Porocytes are

1. located in the body of flatworms and are excretory in function
2. located in the body wall of sponge and regulates incoming water current
3. located in the body of roundworms and are excretory in function
4. located in the body of hydra and regulates the outgoing water current

Q. Choose the correct route of the flow of water inside a sponge.

1. Ostia $\to$ Spongocoel $\to$ Osculum $\to$ Exterior
2. Spongocoel $\to$ Ostia $\to$ Osculum $\to$ Exterior
3. Osculum $\to$ Spongocoel $\to$ Ostia $\to$ Exterior
4. Osculum $\to$ Ostia $\to$ Spongocoel $\to$ Exterior
   

Q. Choose the correct order of water pathway in sponges.

1. Ostia $\to$ Spongocoel $\to$ Osculum
2. Ostia $\to$ Osculum $\to$ Spongocoel
3. Osculum $\to$ Ostia ​​​​​​​$\to$ Spongocoel
4. Spongocoel $\to$ Ostia ​​​​​​​$\to$ Osculum

Q. In case of poriferans, the spongocoel is lined with flagellated cells called

1. ostia
2. oscula
3. choanocytes
4. mesenchymal cells

Q. In case of poriferans, the spongocoel is lined with flagellated cells called

1. ostia
2. oscula
3. choanocytes
4. mesenchymal cells