Pick up the mismatched

Options

A. Annelida-Hydra
B. Nematihelminthes-Ascaris
C. Arthropoda-Cockroach
D. Echinodermata- Starfish

Answer

To solve the question "Pick up the mismatched," we need to analyze the given options and determine which one does not correctly match the organism with its respective phylum.

### Step-by-Step Solution:

1. **Identify the Options**:
- Option 1: Annelida - Hydra
- Option 2: Nematohelminthes - Ascaris
- Option 3: Arthropoda - Cockroach
- Option 4: Echinodermata - Starfish

2. **Analyze Each Option**:
- **Option 1: Annelida - Hydra**:
- Annelida refers to segmented worms. Hydra, however, is not segmented and belongs to the phylum Cnidaria. Therefore, this pair is mismatched.

- **Option 2: Nematohelminthes - Ascaris**:
- Nematohelminthes is the phylum that includes roundworms, and Ascaris is indeed a type of roundworm. This pair is correctly matched.

- **Option 3: Arthropoda - Cockroach**:
- Arthropoda is a phylum characterized by jointed limbs and segmented bodies. Cockroaches are insects that fit this description, making this pair correctly matched.

- **Option 4: Echinodermata - Starfish**:
- Echinodermata includes marine animals with a water vascular system, and starfish are a classic example of this phylum. This pair is also correctly matched.

3. **Conclusion**:
- The only mismatched pair is **Annelida - Hydra**. Therefore, the answer to the question is that this option does not correctly match the organism with its phylum.

### Final Answer:
The mismatched pair is **Annelida - Hydra**.