Identify the incorrect statement regarding tracheary elements of xylem

Options

A. Protoplasts are absent
B. Elongated, cells with lignified secondary walls
C. All groups of plants (vascular) contair both the tracheary elements
D. Chiefly concerned with conduction of water

Answer

To identify the incorrect statement regarding tracheary elements of xylem, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Function of Xylem**:
- Xylem is a type of vascular tissue in plants responsible for the conduction of water and minerals from the roots to the rest of the plant.

2. **Identify the Components of Xylem**:
- Xylem is composed of several elements, including xylem parenchyma, xylem fibers, tracheids, and vessels.

3. **Focus on Tracheary Elements**:
- Tracheary elements are primarily the tracheids and vessels found in xylem. They are responsible for water conduction.

4. **Characteristics of Tracheary Elements**:
- Tracheary elements are elongated cells with lignified secondary walls, and they lack protoplasts (the living part of the cell).

5. **Evaluate the Statements**:
- Now, let’s evaluate the statements provided in the question:
- **Option A**: Protoplast is absent. (Correct statement)
- **Option B**: Elongated cells with lignified secondary wall. (Correct statement)
- **Option C**: All groups of plants contain both tracheary elements. (Incorrect statement)
- **Option D**: (Assuming it is also correct based on the context of the video).

6. **Identify the Incorrect Statement**:
- From the evaluation, Option C is the incorrect statement because not all groups of plants contain both tracheary elements; they are primarily found in angiosperms, pteridophytes, and gymnosperms.

### Conclusion:
- The incorrect statement regarding tracheary elements of xylem is **Option C**: "All groups of plants contain both tracheary elements."