Which animal become asymmetrical due to torsion in body and shell :-

Options

A. Gastropods
B. Cephalopods
C. Pelecypods
D. All of the above

Answer

To solve the question "Which animal becomes asymmetrical due to torsion in body and shell?", we will analyze the options provided and determine which one fits the criteria of asymmetry due to torsion.

### Step-by-Step Solution:

1. **Understanding Torsion**: Torsion is a developmental process that occurs in certain mollusks, particularly gastropods, where the body twists during development. This twisting results in the asymmetry of the body and shell.

2. **Analyzing the Options**:
- **Option 1: Gastropods**: Gastropods, which include snails and slugs, undergo torsion during their development. This results in a characteristic asymmetrical body and shell. Therefore, this option is correct.

- **Option 2: Cephalopods**: Cephalopods, such as octopuses and squids, exhibit bilateral symmetry rather than asymmetry due to torsion. They do not undergo torsion like gastropods. Thus, this option is incorrect.

- **Option 3: Palate Suites**: Palate suites refer to a type of mollusk that typically has two shells (bivalves). They do not exhibit torsion and are symmetrical. Hence, this option is also incorrect.

- **Option 4: All of the above**: Since options 2 and 3 are incorrect, this option is also incorrect.

3. **Conclusion**: The only animal that becomes asymmetrical due to torsion in the body and shell is the gastropod.

### Final Answer:
**Gastropods** are the animals that become asymmetrical due to torsion in their body and shell.