Canal system is characterisitc of

Options

A. Hydra
B. Sea anemone
C. Sponges
D. Sea urchin

Answer

**Step-by-Step Solution:**

1. **Understanding the Canal System**: The canal system, also known as the water circulatory system, is a unique feature found in certain animal groups. It is primarily responsible for the movement of water through the organism, which aids in various physiological processes.

2. **Identifying the Phylum**: The canal system is a characteristic feature of the phylum Porifera. This phylum includes organisms commonly known as sponges.

3. **Function of the Canal System**: In sponges, the canal system plays a crucial role in food acquisition, respiratory gas exchange, and excretion. Water enters through small openings called ostia, moves into a central cavity known as the spongocoel, and exits through a larger opening called the osculum.

4. **Evaluating the Options**:
- Option 1: Hydra - belongs to the phylum Cnidaria and does not have a canal system.
- Option 2: Sea anemone - also belongs to Cnidaria and lacks a canal system.
- Option 3: Sponges - belong to the phylum Porifera and possess a canal system.
- Option 4: Sea urchin - belongs to the phylum Echinodermata and does not have a canal system.

5. **Conclusion**: Based on the analysis, the correct answer is option 3, sponges, as they are the only group listed that possesses a canal system.

**Final Answer**: The canal system is characteristic of sponges (option 3).

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