9 + 2 arrangement of microtubules is absent in flagella of

Options

A. Monera
B. Protista
C. Fungi
D. Animalia

Answer

To solve the question "9 + 2 arrangement of microtubules is absent in flagella of," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the 9 + 2 Arrangement**:
The 9 + 2 arrangement refers to the structure of microtubules in eukaryotic flagella and cilia. It consists of nine outer doublet microtubules surrounding two central singlet microtubules.

2. **Identify the Types of Organisms**:
The options provided are Monera, Protista, Fungi, and Animalia. We need to determine which of these groups does not have the 9 + 2 arrangement in their flagella.

3. **Differentiate Between Prokaryotes and Eukaryotes**:
- Monera includes prokaryotic organisms (like bacteria) that do not have a defined nucleus and typically lack the 9 + 2 arrangement in their flagella.
- Protista, Fungi, and Animalia are eukaryotic groups that do possess the 9 + 2 arrangement in their flagella.

4. **Conclusion**:
Since the 9 + 2 arrangement is characteristic of eukaryotic flagella and is absent in prokaryotic flagella, the correct answer is Monera.

### Final Answer:
The 9 + 2 arrangement of microtubules is absent in the flagella of **Monera**.

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