In Pheretima mouth develops from which of the following

Options

A. Mesoderm
B. Ectoderm
C. Blastopore
D. Endoderm

Explanation

To answer the question "In Pheretima, mouth develops from which of the following?", we will analyze the options provided and understand the embryonic development of Pheretima (earthworm).

### Step-by-Step Solution:

1. **Understanding Germ Layers**:
- In embryonic development, organisms develop from three primary germ layers: ectoderm, mesoderm, and endoderm. Each layer gives rise to different structures in the organism.

2. **Identifying the Options**:
- The options given are:
- A) Mesoderm
- B) Blastoderm
- C) Blastopole
- D) Endoderm

3. **Analyzing the Options**:
- **Mesoderm**: This layer primarily forms muscles, circulatory system, and other internal structures but does not directly form the mouth.
- **Blastoderm**: This term refers to the layer of cells that forms during the early stages of embryonic development but is not specifically responsible for the mouth formation.
- **Blastopole**: This is the opening that forms during gastrulation in the embryo. In many organisms, the mouth develops from this structure.
- **Endoderm**: This layer forms the lining of the digestive tract and other internal organs, but it does not directly form the mouth in Pheretima.

4. **Conclusion**:
- The mouth in Pheretima develops from the blastopole, which is referred to as the proto-stome. Therefore, the correct answer is option C) Blastopole.

### Final Answer:
The mouth in Pheretima develops from the **blastopole** (option C).

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