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The two valves are unequal in the shell ...

The two valves are unequal in the shell of

A

Unio

B

Lamellidens

C

Pinctada

D

All the above

Text Solution

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding the Question**: The question asks about which organism has unequal valves in its shell. The options given are Unio, Lamelladon, and Pinctada. 2. **Identifying the Organisms**: - **Unio**: This is a genus of freshwater bivalves, commonly known as river mussels. They typically have equal-sized valves. - **Lamelladon**: This is another genus of bivalves, also known for having equal-sized valves. - **Pinctada**: This genus includes saltwater oysters, specifically pearl oysters, which are known for having unequal valves. 3. **Analyzing Pinctada**: - Pinctada is characterized by its two unequal shells (valves). - The right valve is flatter compared to the left valve. - The two valves are connected by a long, horny ligament. - There are also hind teeth present in both valves. 4. **Conclusion**: Based on the characteristics of the organisms, the correct answer to the question is **Pinctada**, as it is the only one among the options that has unequal valves. ### Final Answer: The two valves are unequal in the shell of **Pinctada**. ---
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