Which of the following mammals has scrotal testes?

Options

A. Prototherians
B. All placental mammals
C. Elephant
D. Man

Answer

To determine which mammals have scrotal testes, we can analyze the given options step by step.

### Step-by-Step Solution:

1. **Understanding Scrotal Testes**:
- Scrotal testes refer to testes that are located outside the body in a pouch called the scrotum. This positioning helps maintain a lower temperature, which is essential for sperm production.

2. **Evaluating the Options**:
- **Option 1: Prototherians**:
- Prototherians, such as the platypus and echidna, are a group of egg-laying mammals. In these mammals, the testes remain in the abdominal cavity, and they do not have a scrotum.
- **Conclusion**: This option is incorrect.

- **Option 2: All Placental Mammals**:
- While many placental mammals do have scrotal testes, it is not accurate to say that all placental mammals have them. Some may have internal testes.
- **Conclusion**: This option is also incorrect.

- **Option 3: Elephant**:
- Elephants, like prototherians, have their testes located in the abdominal cavity, and they do not possess a scrotum.
- **Conclusion**: This option is incorrect.

- **Option 4: Man (Humans)**:
- In humans, the testes are located in the scrotum, which is outside the abdominal cavity. This positioning is crucial for maintaining the lower temperature required for sperm production.
- **Conclusion**: This option is correct.

3. **Final Answer**:
- The mammal that has scrotal testes is **Option 4: Man (Humans)**.