Assertion:- Cell wall is not only a structural component but also show dynamic role for cell.
Reason:- Cell wall helps in cell to cell interaction and provides barrier to udesirable macromolecules.

Options

A. (a) If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion.
B. (b) If both Assertion & Reason are True but Reason is not a correct explanation of the Assertion.
C. (c) If Assertion is True but the Reason is False.
D. (d) If both Assertion & Reason are false.

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that the cell wall is not just a structural component but also plays a dynamic role in the cell.
- This implies that the cell wall has functions beyond providing shape and support.

2. **Understanding the Reason**:
- The reason given is that the cell wall aids in cell-to-cell interaction and acts as a barrier to undesirable macromolecules.
- This indicates that the cell wall is involved in communication between cells and protects the cell from harmful substances.

3. **Evaluating the Assertion**:
- The cell wall is indeed a structural component, providing rigidity and shape to the cell.
- However, it also has dynamic roles such as facilitating communication between cells and regulating what enters or exits the cell.

4. **Evaluating the Reason**:
- The reason is correct as the cell wall does help in cell-to-cell interactions through structures like plasmodesmata in plant cells.
- It also acts as a barrier, preventing harmful macromolecules from entering the cell.

5. **Conclusion**:
- Both the assertion and reason are correct.
- The reason provides a valid explanation for the assertion, as it highlights the dynamic roles of the cell wall beyond its structural function.

6. **Final Answer**:
- Therefore, the correct answer is that both the assertion and reason are true, and the reason correctly explains the assertion.