In nucleoplasm, a conspicuous body of spherical shape attached to a particular chromosome on a definite position is called

Options

A. Plasmid
B. Karyolymph
C. Nucleolus
D. Nuclear reticulum

Answer

To answer the question regarding the conspicuous body of spherical shape attached to a particular chromosome in the nucleoplasm, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Components of the Nucleus**:
- The nucleus contains various structures, including the nucleoplasm, chromatin, and nucleolus. It's important to differentiate between these components.

2. **Identifying the Structure in Question**:
- The question specifies a "conspicuous body of spherical shape" that is "attached to a particular chromosome." This description fits the characteristics of the nucleolus.

3. **Defining the Nucleolus**:
- The nucleolus is a prominent, round structure found within the nucleus. It is involved in the production of ribosomal RNA (rRNA) and the assembly of ribosomes.

4. **Location of the Nucleolus**:
- The nucleolus is typically located at specific regions on certain chromosomes known as the Nucleolar Organizing Regions (NORs). These are areas where the nucleolus forms and is attached to the chromatin.

5. **Evaluating the Options**:
- The options given are plasmid, karyolymph, nucleolus, and nuclear reticulum.
- **Plasmid**: Extra chromosomal DNA, not relevant here.
- **Karyolymph**: The fluid part of the nucleus, does not fit the description.
- **Nuclear Reticulum**: Refers to the network of chromatin, not a spherical body.
- **Nucleolus**: Matches the description provided in the question.

6. **Conclusion**:
- Based on the definitions and characteristics discussed, the correct answer is **nucleolus**.

### Final Answer:
The conspicuous body of spherical shape attached to a particular chromosome on a definite position in the nucleoplasm is called the **nucleolus**.

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