Nucleolus is :

Options

A. Rounded structure found in cytoplasm near nucleus
B. Rounded structure inside nucleus and having rRNA
C. Rod - shaped structure in cytoplasm near the nucleus
D. None of the above

Answer

### Step-by-Step Solution:

1. **Understanding the Nucleolus**:
- The nucleolus is a prominent structure found within the nucleus of eukaryotic cells. It is not an independent organelle but rather a sub-structure within the nucleus.

2. **Identifying Characteristics**:
- The nucleolus is small, dense, and spherical in shape. It plays a crucial role in the synthesis of ribosomal RNA (rRNA) and the assembly of ribosomes.

3. **Evaluating the Options**:
- **Option 1**: "Rounded structure found in the cytoplasm near nucleus."
- This is incorrect because the nucleolus is located inside the nucleus, not in the cytoplasm.
- **Option 2**: "Rounded structure inside the nucleus and having ribosomal RNA."
- This is correct as it accurately describes the nucleolus.
- **Option 3**: "Rod-shaped structure in Cytoplasm near the Nucleus."
- This is incorrect because the nucleolus is not rod-shaped and is not located in the cytoplasm.
- **Option 4**: "None of the above."
- This is also incorrect since option 2 is a valid description of the nucleolus.

4. **Conclusion**:
- Based on the evaluation of the options, the correct answer is **Option 2**: "Rounded structure inside the nucleus and having ribosomal RNA."