Which of the following is a free living flat worm

Options

A. Planaria
B. schisosoma
C. Fasciola
D. Taenia

Answer

To determine which of the following is a free-living flatworm, we can analyze the options provided:

1. **Identify the options**: The question presents multiple options, but we will focus on the ones mentioned in the video: Planaria, Cystosoma, Trematoda, and another unspecified option.

2. **Evaluate Planaria**:
- Planaria is a genus of flatworms that are known to be free-living. They are commonly found in freshwater environments and are known for their remarkable regenerative abilities.
- Conclusion: Planaria is a free-living flatworm.

3. **Evaluate Cystosoma**:
- Cystosoma is a genus of parasitic flatworms, specifically a type of fluke. They live inside a host organism and do not exist freely in the environment.
- Conclusion: Cystosoma is not a free-living flatworm.

4. **Evaluate Trematoda**:
- Trematoda refers to a class of flatworms that are primarily parasitic. They often require one or more hosts to complete their life cycle.
- Conclusion: Trematoda is not a free-living flatworm.

5. **Evaluate the last option**:
- Without the specific name, we can assume it is also a type of parasitic flatworm, as the video suggests that all other options are parasites.
- Conclusion: This option is also not a free-living flatworm.

6. **Final Answer**: Based on the evaluations, the only free-living flatworm among the options is Planaria. Therefore, the correct answer is **Planaria**.