The .....( i ) ....is a spherical structure present in the nucleoplasm and it is site for ....( ii ) .... synthesis .

Options

A. (i) Nucleus (ii) DNA
B. (i) Ribosome (ii) Protein
C. (i) Centromere (ii) Kinetochore
D. (i) Nucleolus (ii) rRNA

Answer

To solve the question, we need to fill in the blanks with the appropriate terms based on our understanding of cell biology.

### Step-by-Step Solution:

1. **Identify the Structure**: The question mentions a "spherical structure present in the nucleoplasm." In the context of cell biology, the nucleus contains several components, one of which is the nucleolus. The nucleolus is indeed a spherical structure found within the nucleoplasm.

**Hint**: Think about the components of the nucleus and identify which one is spherical.

2. **Function of the Structure**: The question also states that this structure is the site for a specific type of synthesis. The nucleolus is primarily known for its role in synthesizing ribosomal RNA (rRNA), which is essential for the formation of ribosomes.

**Hint**: Recall the functions of the nucleolus and what type of RNA it is responsible for producing.

3. **Fill in the Blanks**: Based on the identification of the structure and its function, we can fill in the blanks:
- (i) Nucleolus
- (ii) rRNA

Therefore, the complete statement would be: "The **nucleolus** is a spherical structure present in the nucleoplasm and it is the site for **rRNA** synthesis."

### Final Answer:
The **nucleolus** is a spherical structure present in the nucleoplasm and it is the site for **rRNA** synthesis.