Lignified tissues are

Options

A. Permeable for gases, solutes and solvents
B. Provided with simple or bordered pits
C. Meant for mechanical strength or conduction
D. All of the above

Answer

**Step-by-Step Solution:**

1. **Understanding Lignified Tissues**: Lignified tissues are plant tissues that contain lignin, a complex organic polymer that provides rigidity and structural support to the plant.

2. **Identifying the Types of Lignified Tissues**: The primary types of lignified tissues include sclerenchyma and xylem. Sclerenchyma cells are known for their thick, lignified cell walls, which contribute to the mechanical strength of the plant.

3. **Functions of Lignified Tissues**:
- **Mechanical Strength**: Lignified tissues provide structural support to the plant, allowing it to stand upright and resist various forces such as wind.
- **Conduction**: In the case of xylem, lignified tissues are involved in the conduction of water and nutrients from the roots to the rest of the plant.
- **Gaseous Exchange**: While lignified tissues are primarily known for their strength and support, they can also have pits (simple or bordered) that allow for some degree of gaseous exchange and movement of solutes.

4. **Analyzing the Options**: The question provides several options regarding the characteristics and functions of lignified tissues:
- A) Permeable to gas, solutes, and solvents
- B) Provided with simple or bordered pits
- C) Mean for mechanical strength or conduction
- D) All of the above

5. **Conclusion**: Since lignified tissues perform all the functions mentioned in the options (they are permeable to gases and solutes, have pits, and provide mechanical strength), the correct answer is **D) All of the above**.

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