Number of radial spokes found in the axoneme of
cilium/flagellum are

Options

A. 2
B. 6
C. 9
D. 11

Answer

To determine the number of radial spokes found in the axoneme of cilia or flagella, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Cilia and Flagella**:
- Cilia and flagella are cellular structures that aid in locomotion. They are composed of microtubules arranged in a specific pattern.

2. **Identifying the Axoneme**:
- The axoneme is the central shaft of cilia and flagella. It is structured in a '9+2' arrangement, which means there are nine doublet microtubules surrounding two central microtubules.

3. **Radial Spokes**:
- Radial spokes are protein structures that extend from the doublet microtubules towards the central pair of microtubules in the axoneme. They play a crucial role in the movement of cilia and flagella.

4. **Counting the Radial Spokes**:
- In the axoneme of cilia and flagella, there are a total of nine radial spokes. Each of the nine outer doublets has one radial spoke connecting to the central pair.

5. **Final Answer**:
- Therefore, the number of radial spokes found in the axoneme of cilia or flagella is **9**.