Regeneration is absent in flatworm

Options

A. Planaria
B. Fasciola
C. Schistosoma
D. Both B and C

Answer

**Step-by-Step Solution:**

1. **Understanding Regeneration**: Regeneration is the biological process where organisms can regrow lost parts or tissues. This ability varies among different species.

2. **Identifying the Organisms**: The question provides four options: Planaria, Fasciola, Schistosoma, and both B and C (Fasciola and Schistosoma). We need to analyze the regeneration capabilities of these organisms.

3. **Analyzing Planaria**: Planaria is known for its remarkable regenerative abilities. If a Planaria is cut in half, both halves can regenerate the missing parts. The anterior end can regenerate the posterior end and vice versa.

4. **Analyzing Fasciola**: Fasciola, also known as the liver fluke, does not exhibit regeneration. If it loses a part, it cannot regenerate it.

5. **Analyzing Schistosoma**: Schistosoma, known as the blood fluke, similarly does not have the ability to regenerate lost parts.

6. **Conclusion**: Since Planaria can regenerate while Fasciola and Schistosoma cannot, the statement "regeneration is absent in flatworms" is true for Fasciola and Schistosoma. Therefore, the correct answer is both B and C.

**Final Answer**: The correct option is both B and C (Fasciola and Schistosoma).

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