Which unicellular organism has a macronucleus for trophic function and one or more micronuclei for reproduction ?

Options

A. Euglena
B. Amoeba
C. Paramecium
D. Trypanosoma

Explanation

To answer the question regarding which unicellular organism has a macronucleus for trophic function and one or more micronuclei for reproduction, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for a unicellular organism that possesses two types of nuclei: a macronucleus for trophic (nutritional) functions and one or more micronuclei for reproductive functions.

2. **Identifying the Organisms**: The options provided are Euglena, Amoeba, and Paramecium. We need to evaluate each organism based on the characteristics of their nuclei.

3. **Evaluating Euglena**:
- Euglena is a unicellular organism, but it primarily has a single nucleus and does not fit the criteria of having both a macronucleus and micronucleus. Therefore, it is not the correct answer.

4. **Evaluating Amoeba**:
- Amoeba is another unicellular organism, but it typically has only one nucleus. It does not have a macronucleus and micronucleus, so it is also not the correct answer.

5. **Evaluating Paramecium**:
- Paramecium is a unicellular organism that possesses two types of nuclei: a large macronucleus and one or more smaller micronuclei.
- The macronucleus is responsible for metabolic functions (trophic functions), while the micronucleus is involved in reproductive functions, particularly during the process of conjugation.

6. **Conclusion**: Based on the evaluation, the correct answer to the question is **Paramecium**.

### Final Answer:
**Paramecium**

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