From the organisms given below, select the odd one on the basis of symmetry shown by them.

Options

A. Meandrina
B. Taenia
C. Psittacula
D. Limulus

Answer

To solve the question of identifying the odd organism based on symmetry, we will follow these steps:

### Step 1: Understand the Types of Symmetry
Symmetry in organisms can be classified into three main types:
- **Radial Symmetry**: Organisms can be divided into similar halves by multiple planes passing through a central axis.
- **Bilateral Symmetry**: Organisms can be divided into two identical halves only along one plane.
- **Asymmetry**: Organisms do not exhibit any symmetry; they cannot be divided into similar halves.

### Step 2: Analyze the Given Organisms
We need to examine the symmetry of each organism mentioned in the question:
1. **Meandrina**: This organism belongs to the phylum Cnidaria and exhibits radial symmetry.
2. **Tinea**: This organism is a type of flatworm (Platyhelminth) and shows bilateral symmetry.
3. **Sitha**: This organism is from the class Aves (birds) and also exhibits bilateral symmetry.
4. **Limulus**: This organism is a horseshoe crab and shows bilateral symmetry as well.

### Step 3: Identify the Odd One Out
From our analysis:
- **Meandrina** shows radial symmetry.
- **Tinea**, **Sitha**, and **Limulus** all show bilateral symmetry.

Since Meandrina is the only organism that exhibits radial symmetry while the others exhibit bilateral symmetry, it is the odd one out.

### Conclusion
The correct answer is **Meandrina** as it shows radial symmetry, which is different from the bilateral symmetry exhibited by the other organisms.

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