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 correct terms related to the structure and function of the nucleolus.

### Step-by-step Solution:

1. **Identify the Structure**: The question mentions a "spherical structure present in the nucleoplasm." The structure that fits this description is the **nucleolus**. The nucleolus is indeed a spherical structure found within the nucleus of eukaryotic cells.

2. **Function of the Structure**: The second part of the question asks for the site of synthesis. The nucleolus is primarily known as the site for the synthesis of **ribosomal RNA (rRNA)**. This is where the components necessary for ribosome assembly are produced.

3. **Final Answer**: Therefore, the complete answer to the question is:
- (i) **nucleolus**
- (ii) **rRNA**

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