Phylum Mollusca is characterized by

Options

A. Diploblastic , Bilaterally symmetrical Coelomates
B. Triploblastic , Bilaterally symmetrical , Pseudocoelomates
C. Triploblastic , Bilaterally symmetrical , Coelomates
D. Diploblastic Radially symmetrical, Acoelomates

Answer

To solve the question regarding the characteristics of Phylum Mollusca, we can break it down into a step-by-step analysis:

### Step-by-Step Solution:

1. **Understanding the Phylum Mollusca**:
- Phylum Mollusca includes a diverse group of animals such as snails, clams, and octopuses. They are known for their soft bodies and are often protected by a hard shell.

2. **Identifying Key Characteristics**:
- We need to identify the key characteristics that define Mollusca. The characteristics we will focus on are:
- Diploblastic or Triploblastic
- Symmetry
- Coelom (body cavity)

3. **Analyzing Symmetry**:
- Mollusks exhibit **bilateral symmetry**. This means their body can be divided into two identical halves along one plane.

4. **Determining Tissue Layers**:
- Mollusks are **triploblastic**, which means they have three primary germ layers: ectoderm, mesoderm, and endoderm.

5. **Examining Coelom**:
- Mollusks have a true coelom, which is a body cavity that is lined with mesodermal tissue. However, it is reduced and often referred to as a **hemocoel** in many mollusks.

6. **Eliminating Incorrect Options**:
- Based on the characteristics:
- **Diploblastic** is incorrect for Mollusca; they are triploblastic.
- **Bilateral symmetry** is correct.
- **Coelom** is present, but it is not a pseudocoelom; it is a true coelom (hemocoel).

7. **Conclusion**:
- The correct answer is that Phylum Mollusca is characterized by being **triploblastic**, **bilaterally symmetrical**, and having a **true coelom** (hemocoel).

### Final Answer:
- The characteristics of Phylum Mollusca include being **triploblastic**, having **bilateral symmetry**, and possessing a **true coelom**.

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