Tracheids differ from other tracheary elements in

Options

A. beng lignified
B. having casparian strips
C. being imperforate
D. lacking nucleus

Answer

### Step-by-Step Solution:

1. **Understanding Tracheids and Tracheary Elements**:
- Tracheids are a type of tracheary element found in the xylem of vascular plants. They play a crucial role in the conduction of water and minerals.

2. **Identifying Characteristics of Tracheids**:
- Tracheids are characterized by their elongated shape and thickened walls. They are dead cells at maturity and do not have a nucleus.

3. **Comparing Tracheids with Other Tracheary Elements**:
- Other tracheary elements include vessel elements (found in angiosperms). Unlike tracheids, vessel elements are perforated, allowing for more efficient water transport.

4. **Key Differences**:
- **Lignification**: Both tracheids and other tracheary elements (like vessel elements) are lignified, meaning they have lignin in their cell walls, providing structural support.
- **Casparian Strips**: Casparian strips are found in the endodermis of roots and are not a characteristic of tracheids or other tracheary elements.
- **Imperforation**: Tracheids are indeed imperforate, meaning they do not have perforation plates like vessel elements do.
- **Nucleus**: Tracheids lack a nucleus at maturity, which is a common trait among tracheary elements.

5. **Conclusion**:
- The primary distinguishing feature of tracheids compared to other tracheary elements is that they are **imperforate**. This means they do not have perforation plates, which is a characteristic of vessel elements.

### Final Answer:
Tracheids differ from other tracheary elements in being **imperforate**.

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