Which is not correctly matched

Options

A. Ascaris - Flame cell
B. Star Fish - Radial symmetry
C. Prawn - Haemocoel
D. Sycon - Canal sytem

Answer

To determine which option is not correctly matched, we will analyze each option provided in the question.

### Step 1: Analyze the first option - Ascaris and Flame Cell
- **Ascaris** is a genus of parasitic nematodes (roundworms).
- **Flame cells** are excretory organs found in flatworms (phylum Platyhelminthes).
- **Conclusion**: Ascaris does not have flame cells; instead, it has **protonephridia** as its excretory organ. Therefore, this option is **not correctly matched**.

### Step 2: Analyze the second option - Starfish and Radial Symmetry
- **Starfish** (or sea stars) belong to the phylum Echinodermata.
- They exhibit **radial symmetry**, meaning their body plan is organized around a central axis.
- **Conclusion**: This option is **correctly matched**.

### Step 3: Analyze the third option - Prawn and Haemocoel
- **Prawn** is a crustacean and belongs to the phylum Arthropoda.
- **Haemocoel** is a body cavity filled with hemolymph (circulatory fluid) found in arthropods.
- **Conclusion**: This option is **correctly matched**.

### Step 4: Analyze the fourth option - Cyclone and Canal System
- **Cyclone** refers to a type of sponge (phylum Porifera).
- Sponges have a **canal system** that helps in water circulation and feeding.
- **Conclusion**: This option is **correctly matched**.

### Final Conclusion
After analyzing all options, the only incorrect match is **Ascaris and Flame Cell**. The correct excretory organ for Ascaris is protonephridia, not flame cells.

### Answer
The option that is not correctly matched is **Ascaris - Flame Cell**.

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