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Shell is spiral in...

Shell is spiral in

A

Pelecypoda

B

Gastropoda

C

Cephalopoda

D

Scaphopoda.

Text Solution

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The correct Answer is:
To solve the question regarding which class of mollusks has a spiral shell, we can follow these steps: ### Step-by-Step Solution: 1. **Understand the Question**: The question asks which class of mollusks has a spiral shell. The options provided are Pileocypoda, Gastropoda, Cephalopoda, and Scaphopoda. 2. **Identify Characteristics of Each Class**: - **Pileocypoda**: This class is not known for having spiral shells. - **Gastropoda**: This class is characterized by its spiral shells. The shells can exhibit chirality, which means they can be either left-handed (sinistral) or right-handed (dextral). - **Cephalopoda**: Members of this class, such as squids and octopuses, typically do not have spiral shells. - **Scaphopoda**: This class has elongated, tusk-shaped shells, not spiral ones. 3. **Focus on Gastropoda**: The spiral shell is a defining feature of the Gastropoda class. The spiral shape is a result of the embryonic development process known as spiral cleavage. 4. **Confirm the Answer**: Since Gastropoda is the only class listed that is known for having spiral shells, we can conclude that the correct answer is Gastropoda. 5. **Final Answer**: The correct answer is **B) Gastropoda**.
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