Lignin is deposited in a net-like manner in which of the following types of thickening in inner walls of tracheids?
(1) Annular
(2) Spiral
(3) Scalariform
(4) Reticulate

Answer

To solve the question regarding the deposition of lignin in a net-like manner in the inner walls of tracheids, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Tracheids**: Tracheids are elongated cells in the xylem of vascular plants that help in the conduction of water and provide structural support. They have thickened cell walls.

2. **Types of Lignin Thickening**: The thickening of the inner walls of tracheids can occur in various patterns, which include:
- Annular (ring-like)
- Spiral (spiral bands)
- Scalariform (ladder-like)
- Reticulate (net-like)

3. **Analyzing Each Option**:
- **Annular**: This type involves lignin deposition in a ring-like structure. It does not exhibit a net-like appearance.
- **Spiral**: This involves lignin forming spiral bands around the tracheids. Again, this does not represent a net-like structure.
- **Scalariform**: This type has a ladder-like appearance, which is also distinct from a net-like structure.
- **Reticulate**: This type of thickening is characterized by a net-like arrangement of lignin deposits.

4. **Identifying the Correct Answer**: The question specifically asks for the type of thickening where lignin is deposited in a net-like manner. Based on the analysis, the correct answer is **Reticulate**.

5. **Conclusion**: Therefore, the answer to the question is option (4) Reticulate.

### Final Answer:
The correct answer is **(4) Reticulate**.