Assertion Q.
Due to fragmentation in Planaria, each part develops the remaining body parts and becomes a complete animal
Reason R. Differentiated tissue present in each broken part of Planaria undergoes de-diferentiation and then differentiation in regeneration.

Options

A. Q and R both are correct and R is not a correct reason for Q
B. Q and R both are correct and R is correct reason for Q
C. Q and R both are wrong
D. Q is correct but R is wrong.

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion (Q)**: The assertion states that due to fragmentation in Planaria, each part develops the remaining body parts and becomes a complete animal.
- **Analysis**: This statement is incorrect. The process described is not fragmentation but rather regeneration. In Planaria, when a part is cut off, it can regenerate into a complete organism, but this is not termed fragmentation.

2. **Understanding the Reason (R)**: The reason states that differentiated tissue present in each broken part of Planaria undergoes de-differentiation and then differentiation in regeneration.
- **Analysis**: This statement is correct. In the process of regeneration, the cells in the broken part of Planaria undergo de-differentiation (where specialized cells revert to a more primitive state) and then re-differentiate to form the necessary tissues and organs.

3. **Conclusion**: Since the assertion (Q) is incorrect and the reason (R) is correct, we can conclude that the assertion does not support the reason provided. Therefore, both Q and R cannot be considered correct.

### Final Answer:
Both Assertion (Q) and Reason (R) are incorrect.