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

Options

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

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

### Step 2: Identify the Options
The options provided are:
A. Trypanosoma
B. Paramecium
C. Euglena
D. Amoeba

### Step 3: Analyze Each Option
- **A. Trypanosoma**: This is a unicellular organism, but it does not have a macronucleus and micronucleus structure.
- **B. Paramecium**: This organism is known to have a macronucleus for trophic functions and one or more micronuclei for reproduction. It is a heterokaryotic organism.
- **C. Euglena**: While it is unicellular, it does not possess a macronucleus and micronucleus structure.
- **D. Amoeba**: This organism has a single nucleus and does not have the macronucleus and micronucleus structure.

### Step 4: Conclusion
Based on the analysis, the only organism that fits the description of having a macronucleus for trophic function and one or more micronuclei for reproduction is **Paramecium**.

### Final Answer
The answer to the question is **B. Paramecium**.

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