Which of the following statements is incorrect for centrioles ?

Options

A. Both the centrioles in centrosome lie perpendicular to each other.
B. Central proteinaceous hub is missing in a centriole.
C. Each centriole has an organisation like that of a cartwheel.
D. Centrosome usually contains 2 cylindrical centrioles.

Answer

To determine which statement is incorrect regarding centrioles, let's analyze each option provided in the question step by step.

### Step-by-Step Solution:

1. **Understanding Centrioles**:
- Centrioles are cylindrical structures found in most eukaryotic cells, typically in pairs.
- They are surrounded by a material known as pericentriolar material.

2. **Analyzing Each Statement**:
- **Option A**: "Both the centrioles in the centrosome lie perpendicular to each other."
- This statement is **correct**. In a centrosome, the two centrioles are indeed oriented perpendicularly to each other.

- **Option B**: "Central proteinaceous hub is missing in a centriole."
- This statement is **incorrect**. Each centriole has a central proteinaceous hub that connects to the peripheral microtubules via radial spokes.

- **Option C**: "Each centriole has an organization like that of a cartwheel."
- This statement is **correct**. The structure of a centriole resembles a cartwheel due to the arrangement of its microtubules.

- **Option D**: "Centrosome usually contains two cylindrical centrioles."
- This statement is **correct**. The centrosome typically consists of two cylindrical centrioles.

3. **Conclusion**:
- The incorrect statement regarding centrioles is **Option B**: "Central proteinaceous hub is missing in a centriole."

### Final Answer:
The incorrect statement for centrioles is **Option B**: "Central proteinaceous hub is missing in a centriole."

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