Which pair has lignin in both?

Options

A. Tracheid and collenchyma
B. Sclerechyma and sieve tube
C. Sclerenchyma and tracheids
D. Parenchyma and endodermis

Explanation

To solve the question "Which pair has lignin in both?", we will analyze the options provided and identify which pairs contain lignin in their cell walls.

### Step-by-Step Solution:

1. **Understand the Components**:
- Lignin is a complex organic polymer found in the cell walls of many plants, providing rigidity and structural support. It is primarily found in the xylem tissues of plants.

2. **Identify the Options**:
- The options given are:
- Trachea and Collenchyma
- Sclerenchyma and Sieve Tubes
- Sclerenchyma and Trachea
- Parenchyma and Endodermis

3. **Analyze Each Pair**:
- **Trachea and Collenchyma**:
- Trachea (part of xylem) contains lignin in its cell walls.
- Collenchyma has cell walls made of cellulose and does not contain lignin.
- **Conclusion**: This pair does not have lignin in both.

- **Sclerenchyma and Sieve Tubes**:
- Sclerenchyma cells have thickened cell walls that often contain lignin.
- Sieve tubes (part of phloem) have cell walls made of cellulose and do not contain lignin.
- **Conclusion**: This pair does not have lignin in both.

- **Sclerenchyma and Trachea**:
- Sclerenchyma cells contain lignin in their cell walls.
- Trachea contains lignin in its cell walls as part of the xylem.
- **Conclusion**: This pair has lignin in both.

- **Parenchyma and Endodermis**:
- Parenchyma cells have cell walls made of cellulose and do not contain lignin.
- Endodermis cells may have some special chemical deposits, but they primarily consist of parenchyma-like cells with cellulose walls.
- **Conclusion**: This pair does not have lignin in both.

4. **Final Conclusion**:
- The only pair that has lignin in both is **Sclerenchyma and Trachea**.

### Answer:
The correct answer is **Sclerenchyma and Trachea**.

---