The movement of water in syconoid type of canal system is

Options

A. Dermal ostia ` to ` Canal ` to ` Spongocoel ` to ` Osculum
B. Dermal ostia ` to` Incurrent canal ` overset("Prosoyle")to` Radial canal ` overset ("Apopyle")to ` Spongocoel `to` Osculum
C. Dermal ostia `to` Incurrent canal ` overset ("Prosopyle")to` Flagelated chamber `overset ("Apopyle")to` Excurrent canal `to` Spongocoel ` to` Osculum
D. Pinacocytes `to ` Choanocytes `to` Enteron ` to ` Osculum

Answer

### Step-by-Step Solution:

1. **Understanding Syconoid Canal System**:
- The syconoid type of canal system is found in certain sponges. It is characterized by a more complex structure compared to the asconoid type, allowing for increased surface area for filter feeding.

2. **Water Entry through Dermal Ostia**:
- Water enters the sponge through small pores called dermal ostia. These ostia are located on the outer surface of the sponge.

3. **Movement to Incurrent Canals**:
- After entering through the dermal ostia, the water flows into the incurrent canals. These canals are spaces formed by the folding of the sponge body wall.

4. **Transition through Prosopyle**:
- The water then passes through a structure called the prosopyle, which connects the incurrent canals to the radial canals.

5. **Flow into Radial Canals**:
- In the radial canals, the water is further processed. These canals are lined with choanocytes (flagellated cells) that help in filtering and moving the water.

6. **Passing through Apopyle**:
- The water then moves through the apopyle, which is an opening that leads from the radial canals to the spongocoel.

7. **Entering the Spongocoel**:
- The spongocoel is the central cavity of the sponge where water collects.

8. **Exiting through Osculum**:
- Finally, the water exits the sponge through the osculum, which is the large opening at the top of the sponge.

### Summary of Water Movement:
The sequence of water movement in the syconoid canal system is as follows:
- Dermal Ostia → Incurrent Canals → Prosopyle → Radial Canals → Apopyle → Spongocoel → Osculum

### Final Answer:
The movement of water in the syconoid type of canal system is: **Dermal ostia → Incurrent canals → Prosopyle → Radial canal → Apopyle → Spongocoel → Osculum**.

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