The number of nucleus in paramecium is

Options

A. One
B. Two
C. Three
D. Four

Answer

**Step-by-Step Solution:**

1. **Identify the Organism**: The question asks about the number of nuclei in Paramecium, which is a member of the phylum Protozoa and the class Ciliata.

2. **Understand Nuclear Structure**: Paramecium exhibits a condition known as nuclear dimorphism, meaning it has two types of nuclei.

3. **Types of Nuclei**:
- **Macronucleus**: There is one macronucleus in Paramecium. This nucleus is larger and is responsible for the metabolic functions of the cell.
- **Micronucleus**: In addition to the macronucleus, Paramecium also has one micronucleus. This smaller nucleus plays a critical role in reproduction and genetic exchange.

4. **Count the Nuclei**: Since Paramecium has one macronucleus and one micronucleus, the total number of nuclei in Paramecium is two.

5. **Conclusion**: Therefore, the correct answer to the question is that Paramecium has two nuclei.

**Final Answer**: The number of nuclei in Paramecium is **2**.

---