Biradial symmetry is found in

Options

A. Obelia
B. Sea anemone
C. Hydra
D. Aurelia

Answer

To determine which organism exhibits biradial symmetry, we can follow these steps:

### Step 1: Understand the concept of symmetry
Symmetry in biology refers to the arrangement of body parts. There are several types of symmetry, including bilateral, radial, and biradial symmetry.

### Step 2: Identify the types of symmetry
- **Bilateral symmetry**: Organisms can be divided into two equal halves along one plane (e.g., humans).
- **Radial symmetry**: Organisms can be divided into similar halves around a central axis (e.g., jellyfish).
- **Biradial symmetry**: A combination of radial and bilateral symmetry, where organisms can be divided into two equal halves in more than one plane (e.g., certain cnidarians).

### Step 3: Analyze the given options
The question provides four options:
A. Obelia
B. Sea Anemone
C. Hydra
D. Aurelia

### Step 4: Determine the symmetry of each organism
- **Obelia**: Exhibits radial symmetry.
- **Sea Anemone**: Primarily exhibits radial symmetry but can show biradial symmetry due to its body structure.
- **Hydra**: Exhibits radial symmetry.
- **Aurelia**: Exhibits radial symmetry.

### Step 5: Identify the correct answer
Among the options, the **Sea Anemone** (option B) is noted for its ability to exhibit biradial symmetry, especially in certain aspects of its anatomy.

### Final Answer
The organism that exhibits biradial symmetry is **B. Sea Anemone**.

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