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

Answer

To solve the question of 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. **Understand the Question**: The question asks for a unicellular organism that possesses two types of nuclei: a macronucleus and one or more micronuclei. The macronucleus is involved in trophic (nutritional) functions, while the micronucleus is involved in reproduction.

2. **Review the Options**: The options provided are:
- Euglena
- Amoeba
- Paramecium
- Trypanosoma

3. **Analyze Each Option**:
- **Euglena**: This is a unicellular organism that is a flagellate and does not have both types of nuclei as described.
- **Amoeba**: This is a unicellular organism known for its ability to change shape but does not have a macronucleus and micronucleus.
- **Paramecium**: This organism has both a macronucleus (which is involved in metabolic processes) and one or more micronuclei (which are involved in reproduction).
- **Trypanosoma**: This is a genus of parasitic protozoa that does not possess the described nuclear structure.

4. **Identify the Correct Answer**: Based on the analysis, Paramecium is the only organism among the options that has a macronucleus for trophic functions and one or more micronuclei for reproduction.

5. **Conclude**: Therefore, the correct answer to the question is **Paramecium**.

### Final Answer:
The unicellular organism that has a macronucleus for trophic function and one or more micronuclei for reproduction is **Paramecium**.