Assertion : The middle lamella is a layer made up of calcium pectate.
Reason : It holds the different neighouring cells together.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If both assertion and reason are false.

Explanation

To solve the question regarding the assertion and reason about the middle lamella, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Assertion**: The assertion states that "The middle lamella is a layer made up of calcium pectate."
- **Evaluation**: This statement is true. The middle lamella is indeed primarily composed of calcium pectate, which acts as a cementing substance between plant cells.

2. **Understand the Reason**: The reason states that "It holds the different neighbouring cells together."
- **Evaluation**: This statement is also true. The middle lamella does serve the function of holding adjacent plant cells together by providing a binding layer.

3. **Determine the Relationship**: Now, we need to evaluate whether the reason correctly explains the assertion.
- **Analysis**: While both statements are true, the reason does not explain why the middle lamella is made up of calcium pectate. The composition (calcium pectate) does not inherently explain the function (holding cells together).

4. **Conclusion**: Therefore, we conclude that both the assertion and reason are true, but the reason is not the correct explanation of the assertion.

### Final Answer:
Both the assertion and reason are true, but the reason is not the correct explanation of the assertion.

---