A single mitochondrion is found in

Options

A. Flight muscles of insects
B. Human sperm
C. Micrasterias
D. Chaos chaos

Answer

To answer the question "A single mitochondrion is found in," we will analyze the options provided and determine which one contains a single mitochondrion.

### Step-by-Step Solution:

1. **Understanding Mitochondria**: Mitochondria are known as the powerhouse of the cell, responsible for producing energy in the form of ATP. The number of mitochondria in a cell can vary significantly depending on the cell's energy requirements.

2. **Analyzing the First Option - Flight Muscles of Insects**:
- Flight muscles require a lot of energy for movement.
- Therefore, these muscles contain a large number of mitochondria, approximately 500,000.
- **Conclusion**: This option is incorrect as it contains many mitochondria, not a single one.

3. **Analyzing the Second Option - Human Sperm**:
- Human sperm cells also require energy for motility.
- They contain around 200 to 400 mitochondria to support their function.
- **Conclusion**: This option is also incorrect as it contains multiple mitochondria.

4. **Analyzing the Third Option - Microsterias**:
- Microsterias is a type of unicellular green algae.
- Being unicellular, it is known to have only one mitochondrion.
- **Conclusion**: This option is correct as it contains a single mitochondrion.

5. **Analyzing the Fourth Option - Ciliates**:
- Ciliates are a group of protozoa that typically have a high number of mitochondria.
- They can have approximately 500,000 mitochondria.
- **Conclusion**: This option is incorrect as it also contains many mitochondria.

### Final Answer:
The correct answer is **Microsterias**, as it is the only option that contains a single mitochondrion.

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