Echinoderms show
(a) Bilateral symmetry
(b) Radial symmetry
(c) Asymmetry
(d) None

Options

A. Bilateral symmetry
B. Radial symmetry
C. Asymmetry
D. None

Answer

To solve the question regarding the type of symmetry exhibited by echinoderms, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question asks what type of symmetry echinoderms exhibit. The options provided are:
- (a) Bilateral symmetry
- (b) Radial symmetry
- (c) Asymmetry
- (d) None

2. **Define the Types of Symmetry**:
- **Asymmetry**: This means that the organism does not have any symmetry. An example is sponges (phylum Porifera).
- **Radial Symmetry**: This type of symmetry allows an organism to be divided into similar halves by multiple planes passing through the central axis. It is commonly seen in organisms like cnidarians and is also present in echinoderms, particularly in their adult forms.
- **Bilateral Symmetry**: This means that the organism can be divided into two equal halves by a single plane. This type of symmetry is typically found in higher organisms and is observed in echinoderms only during their larval stage.

3. **Analyze Echinoderms**: Echinoderms, which belong to the phylum Echinodermata, exhibit:
- **Radial Symmetry** in their adult forms, allowing them to be divided into multiple parts around a central axis.
- **Bilateral Symmetry** only in their larval stage, which is not applicable to the adult form.

4. **Choose the Correct Option**: Since the question specifically refers to the symmetry exhibited by adult echinoderms, the correct answer is:
- (b) Radial symmetry.

5. **Conclusion**: Therefore, the final answer to the question is that echinoderms show radial symmetry.

### Final Answer:
**(b) Radial symmetry**