Select the mismatch from the following

Options

A. Helix - Organ system level of organization
B. Asterias - Presence of water vascular system
C. Neries - Excretion by flame cells
D. Eye worm - Pseudocoelomate

Answer

To solve the question of selecting the mismatch from the given options, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding the Options**:
- We have four options to analyze, each consisting of an organism and its corresponding feature or classification.

2. **Option 1: Helix**
- **Organism**: Helix (Garden Snail)
- **Phylum**: Mollusca
- **Feature**: Organ system level of organization
- **Analysis**: Helix, being a garden snail, does indeed belong to the phylum Mollusca, which exhibits an organ system level of organization. This match is correct.

3. **Option 2: Asterias**
- **Organism**: Asterias (Starfish)
- **Phylum**: Echinodermata
- **Feature**: Water vascular system
- **Analysis**: Asterias is a starfish and belongs to the phylum Echinodermata, which is characterized by the presence of a water vascular system. This match is also correct.

4. **Option 3: Neris**
- **Organism**: Neris (a type of polychaete worm)
- **Phylum**: Annelida
- **Feature**: Excretion by flame cell
- **Analysis**: Neris belongs to the phylum Annelida, and its excretion occurs via nephridia, not flame cells. Flame cells are the excretory structures found in Platyhelminthes (flatworms). Therefore, this match is incorrect.

5. **Option 4: Eye Worm (Loa Loa)**
- **Organism**: Loa Loa (Eye worm)
- **Phylum**: Asclemynthus (Nematoda)
- **Feature**: Pseudocoelomate
- **Analysis**: Loa Loa is a roundworm and belongs to the phylum Nematoda, which is characterized by having a pseudocoelom. This match is correct.

### Conclusion:
The mismatch is found in **Option 3: Neris**, which incorrectly states that excretion occurs by flame cells instead of nephridia. Thus, the correct answer is **Option 3**.

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