9 + 2 organisation is present in

Options

A. Flagella of bacteria
B. Flagella and cilia of eukaryotic cell Basel body
C. Basal body
D. Centriole and basal body

Answer

To solve the question regarding the "9 + 2 organization," we can break it down into the following steps:

### Step-by-Step Solution:

1. **Understanding the 9 + 2 Organization**:
- The term "9 + 2 organization" refers to a specific arrangement of microtubules found in certain cellular structures. It consists of nine outer doublet microtubules and two central singlet microtubules.

2. **Identifying Where This Organization is Found**:
- The 9 + 2 arrangement is primarily found in the flagella and cilia of eukaryotic cells. These structures are hair-like appendages that protrude from the surface of cells.

3. **Distinguishing Between Flagella and Cilia**:
- Flagella are typically longer and fewer in number (usually one or two per cell), while cilia are shorter and more numerous (often covering the entire surface of the cell).

4. **Role of Microtubules in Movement**:
- The microtubules in the 9 + 2 arrangement are responsible for the movement of flagella and cilia. They are connected by proteins such as nexin and dynein, which facilitate the bending and movement of these structures.

5. **Conclusion**:
- Therefore, the correct answer to the question is that the "9 + 2 organization" is present in the flagella and cilia of eukaryotic cells.

### Final Answer:
The 9 + 2 organization is present in the flagella and cilia of eukaryotic cells.

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