Arrangement of axonemal microtubules in cilia or flagella is:-

Answer

### Step-by-Step Solution:

1. **Understanding Cilia and Flagella**:
- Cilia and flagella are hair-like structures that extend from the surface of many eukaryotic cells. They are involved in movement and locomotion.

2. **Structure of Cilia and Flagella**:
- Both cilia and flagella are covered by a plasma membrane, which encloses their internal structure.

3. **Core Structure**:
- The core of cilia and flagella is known as the **axoneme**. This is the structural framework that supports their function.

4. **Microtubule Arrangement**:
- The axoneme consists of microtubules arranged in a specific pattern. The arrangement is crucial for the movement of cilia and flagella.

5. **Arrangement Details**:
- The axoneme typically has **nine pairs of radially arranged microtubules** (these are the outer doublets).
- Additionally, there is **one pair of centrally located microtubules**.

6. **Final Arrangement**:
- Therefore, the total arrangement of microtubules in cilia and flagella is described as **"9 + 2"**. This means there are nine pairs of outer microtubules and two central microtubules.

### Answer:
The arrangement of axonemal microtubules in cilia or flagella is called **"9 + 2"**.

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