Which life function is carried on by a Paramecium but not by a neuron ?

Options

A. Synthesis
B. Absorption
C. Regulation
D. Locomotion

Answer

To answer the question "Which life function is carried on by a Paramecium but not by a neuron?", we will analyze the life functions associated with both Paramecium and neurons.

### Step-by-Step Solution:

1. **Understanding Paramecium**:
- Paramecium is a unicellular organism that belongs to the kingdom Protista. It is known for its ability to move and feed using tiny hair-like structures called cilia.

2. **Understanding Neurons**:
- Neurons are specialized cells in multicellular organisms that transmit nerve impulses. They are primarily involved in communication within the nervous system.

3. **Identifying Life Functions**:
- Life functions include synthesis, absorption, regulation, and locomotion. We will evaluate each function to see which one is unique to Paramecium.

4. **Evaluating Synthesis**:
- Both Paramecium and neurons perform synthesis. Paramecium synthesizes proteins, while neurons synthesize neurotransmitters. Thus, synthesis is not the correct answer.

5. **Evaluating Absorption**:
- Both organisms can absorb nutrients. Paramecium absorbs food through its oral groove, and neurons absorb nutrients from their environment. Therefore, absorption is also not the correct answer.

6. **Evaluating Regulation**:
- Regulation is performed by both. Paramecium regulates its internal environment (like water balance), while neurons regulate metabolic processes and responses. Hence, regulation is not the correct answer.

7. **Evaluating Locomotion**:
- Paramecium uses cilia for locomotion, allowing it to move through water and capture food. Neurons, on the other hand, do not have the ability to move independently. Therefore, locomotion is a function that Paramecium performs but neurons do not.

8. **Conclusion**:
- The life function carried out by Paramecium but not by a neuron is **locomotion**.

### Final Answer:
**Locomotion**