Which of the following is not correctly matched?

Options

A. Sycon-Canal system
B. Starfish -Radial Symmetry
C. Ascaris - Flame cell
D. Prawn -Haemocol

Answer

To determine which of the following options is not correctly matched, we will analyze each option one by one.

### Step-by-Step Solution:

1. **Option A: Psychon is matched with Canal System**
- Psychon is a type of sponge, and sponges belong to the phylum Porifera.
- The canal system is indeed a characteristic feature of sponges, as it consists of a network of pores and channels that facilitate water flow.
- **Conclusion:** This option is correctly matched.

2. **Option B: Starfish is matched with Radial Symmetry**
- Starfish (or sea stars) exhibit radial symmetry, which means they can be divided into equal halves along multiple planes.
- This is a defining characteristic of echinoderms, the group to which starfish belong.
- **Conclusion:** This option is correctly matched.

3. **Option C: Ascaris is matched with Flame Cells**
- Ascaris is a roundworm and belongs to the phylum Nematoda.
- Flame cells are specialized excretory structures found in flatworms (phylum Platyhelminthes), not in roundworms.
- Therefore, this option is incorrectly matched.
- **Conclusion:** This option is not correctly matched.

4. **Option D: Prawns are matched with Blood-filled Body Cavity (Hemocoel)**
- Prawns are crustaceans and belong to the phylum Arthropoda.
- They possess a hemocoel, which is a blood-filled body cavity typical of arthropods.
- **Conclusion:** This option is correctly matched.

### Final Answer:
The option that is not correctly matched is **Option C: Ascaris with Flame Cells**.

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