Plasmotomy occurs in

Options

A. Hydra
B. Obelia
C. Opalina
D. Plasmodium

Answer

**Step-by-Step Solution:**

1. **Understanding Plasmotomy**:
- Plasmotomy is a type of asexual reproduction where a multinucleate cell divides into two or more multinucleate daughter cells. This process is a form of binary fission.

2. **Identifying the Organisms**:
- The question provides four options: Hydra, Obelia, Opalina, and Plasmodium. We need to determine which of these undergoes plasmotomy.

3. **Analyzing the Options**:
- **Hydra**: This organism belongs to the phylum Cnidaria and reproduces asexually through budding, not plasmotomy.
- **Obelia**: Like Hydra, Obelia also belongs to the phylum Cnidaria and reproduces asexually through budding. Therefore, it does not undergo plasmotomy.
- **Opalina**: This organism is a protozoan and is known to undergo plasmotomy.
- **Plasmodium**: Although Plasmodium is a protozoan, it does not exhibit binary fission, which is necessary for plasmotomy.

4. **Conclusion**:
- Since plasmotomy is exclusive to protozoans and occurs in Opalina, the correct answer is Opalina.

**Final Answer**: Plasmotomy occurs in Opalina.

---