Which of the following provides energy for the movement of sperm in mammals?

Options

A. Tail only
B. Middle priece only
C. Head only
D. Tail and middle piece

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks which part of the sperm provides energy for its movement in mammals.

2. **Identifying the Structure of Sperm**: The sperm consists of several parts:
- **Head**: Contains the nucleus and genetic material.
- **Middle Piece**: Contains mitochondria, which are responsible for energy production.
- **Tail (Flagellum)**: Responsible for the movement of the sperm.

3. **Role of Mitochondria**: Mitochondria are known as the powerhouse of the cell. They produce adenosine triphosphate (ATP), which is the energy currency of the cell.

4. **Energy Requirement for Movement**: For the sperm to swim and reach the egg, it requires energy. This energy is supplied by the mitochondria located in the middle piece of the sperm.

5. **Evaluating the Options**:
- **Tail only**: Incorrect, as the tail provides movement but does not produce energy.
- **Middle piece only**: Correct, as it contains mitochondria that provide ATP for energy.
- **Head**: Incorrect, as it contains genetic material and does not contribute to energy production.
- **Tail and middle piece**: Incorrect, since only the middle piece has the mitochondria that provide energy.

6. **Conclusion**: The correct answer is the **middle piece only**, as it is the part of the sperm that contains the mitochondria, which provide energy for movement.