Read the following statements (A to E) carefully:
A. Diploplastic
B. Bilateral symmetrical
C. Tissue level of organization
D. Pseudocoelomate
E. Metameric segmentation
Which of the above features regarding sea walnuts incorrect?

Options

A. A and B only
B. A, B, C and E
C. B, D and E
D. A, B, C, D and E

Answer

To determine which features regarding sea walnuts (Ctenophora) are incorrect, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Identify the Classification of Sea Walnuts**:
- Sea walnuts belong to the phylum **Ctenophora**.

2. **Analyze Statement A: Diploblastic**:
- Sea walnuts are indeed **diploblastic**, meaning they have two germ layers: ectoderm and endoderm.
- **Conclusion**: This statement is **correct**.

3. **Analyze Statement B: Bilateral Symmetrical**:
- Sea walnuts exhibit **radial symmetry**, not bilateral symmetry.
- **Conclusion**: This statement is **incorrect**.

4. **Analyze Statement C: Tissue Level of Organization**:
- Sea walnuts possess a **tissue level of organization**, where cells are organized into tissues.
- **Conclusion**: This statement is **correct**.

5. **Analyze Statement D: Pseudocoelomate**:
- Sea walnuts are classified as **acoelomate**, meaning they do not have a coelom (body cavity). They are not pseudocoelomates.
- **Conclusion**: This statement is **incorrect**.

6. **Analyze Statement E: Metameric Segmentation**:
- Sea walnuts do not exhibit **metameric segmentation**. This feature is characteristic of organisms like earthworms.
- **Conclusion**: This statement is **incorrect**.

### Summary of Findings:
- The incorrect features regarding sea walnuts are:
- B: Bilateral symmetrical (incorrect)
- D: Pseudocoelomate (incorrect)
- E: Metameric segmentation (incorrect)

### Final Answer:
The incorrect features regarding sea walnuts are **B, D, and E**.

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