Axoneme having 9 + 2 doublet microtubule arrangement is found in

Options

A. cilia and flagella
B. centriole
C. cilia
D. flagella

Answer

To solve the question regarding the axoneme with a 9 + 2 doublet microtubule arrangement, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure of Axoneme**:
- The axoneme is the core structure of cilia and flagella. It is made up of microtubules arranged in a specific pattern.

**Hint**: Recall that the axoneme is a key component of cilia and flagella.

2. **Identify the Microtubule Arrangement**:
- The 9 + 2 arrangement refers to 9 outer doublet microtubules surrounding 2 central single microtubules. This is a characteristic feature of the axoneme.

**Hint**: Remember that "9 + 2" indicates the number of microtubule arrangements in the axoneme.

3. **Recognize Where This Arrangement is Found**:
- This specific arrangement of microtubules is found in both cilia and flagella. Both structures are cellular projections that aid in movement.

**Hint**: Think about the functions of cilia and flagella in cells.

4. **Evaluate the Options**:
- If the options provided include cilia, flagella, or both, we can conclude that the correct answer must include both since they share this microtubule arrangement.

**Hint**: Analyze the options carefully to see if they specify cilia, flagella, or both.

5. **Conclude the Answer**:
- Since both cilia and flagella have the 9 + 2 microtubule arrangement, the correct answer is that this arrangement is found in both cilia and flagella.

**Hint**: The final answer should reflect the presence of the structure in both types of cellular projections.

### Final Answer:
The axoneme having a 9 + 2 doublet microtubule arrangement is found in both cilia and flagella.