9+ 0 arrangement is found in

Options

A. Flagellum
B. Centriole
C. Cilium
D. Spindle fibres

Answer

To solve the question regarding the "9+0 arrangement," we will analyze the options provided and identify the correct answer step by step.

### Step-by-Step Solution:

1. **Understanding the 9+0 Arrangement**:
- The "9+0 arrangement" refers to a specific structural organization of microtubules in certain cellular structures. In this arrangement, there are nine peripheral microtubule triplets, but no central microtubules.

2. **Analyzing the Options**:
- **Option 1: Flagellum**:
- Flagella typically have a "9+2 arrangement," meaning they consist of nine doublet microtubules surrounding two central microtubules. Therefore, this option is incorrect.

- **Option 2: Centriole**:
- Centrioles are known to have a "9+0 arrangement." They consist of nine triplet microtubules arranged in a cylindrical structure, with no central microtubules. This option is correct.

- **Option 3: Cilium**:
- Similar to flagella, cilia also have a "9+2 arrangement." Thus, this option is incorrect.

- **Option 4: Spindle Fibers**:
- Spindle fibers are involved in cell division but do not have a defined "9+0 arrangement." They are primarily composed of microtubules that can be organized differently. Therefore, this option is also incorrect.

3. **Conclusion**:
- Based on the analysis, the structure that exhibits the "9+0 arrangement" is the **centriole**.

### Final Answer:
The "9+0 arrangement" is found in **Centrioles**.

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