Which species of Paramecium contains three nuclei ?

Options

A. P. caudatum
B. P. .polycarpum
C. P. multimicronucleatum
D. P. aurelia

Answer

To determine which species of Paramecium contains three nuclei, we can follow these steps:

### Step 1: Understand the Question
The question asks for a specific species of Paramecium that has three nuclei.

### Step 2: Identify the Options
The options provided are:
1. Paramecium caudatum
2. Paramecium polycarpum
3. Paramecium multi-micronucleatum
4. Paramecium aurelia

### Step 3: Review the Characteristics of Paramecium
Paramecium is a unicellular organism that has two types of nuclei:
- **Macronucleus**: Larger, responsible for vegetative functions.
- **Micronucleus**: Smaller, responsible for reproductive functions.

### Step 4: Analyze Each Option
1. **Paramecium caudatum**: Typically has one macronucleus and one or more micronuclei, but not three nuclei.
2. **Paramecium polycarpum**: Similar to caudatum, it does not have three nuclei.
3. **Paramecium multi-micronucleatum**: The name suggests multiple micronuclei, but it does not specify three nuclei.
4. **Paramecium aurelia**: This species is known to have one macronucleus and two micronuclei, totaling three nuclei.

### Step 5: Conclusion
Based on the analysis, the species of Paramecium that contains three nuclei is **Paramecium aurelia**.

### Final Answer
**Paramecium aurelia** is the species that contains three nuclei.

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