In which of the following, testes remain in abdomen and do not descend in serotum

Options

A. Elephant
B. Rabbit
C. Human
D. Ox

Answer

**Step-by-Step Solution:**

1. **Understanding Testes Location**: Testes are typically located outside the body in a pouch called the scrotum. This is essential for sperm production (spermatogenesis) because sperm requires a lower temperature than the internal body temperature for optimal development.

2. **Identifying Exceptions**: While most mammals have testes that descend into the scrotum, there are exceptions where the testes remain in the abdomen.

3. **Identifying the Organisms**: The two notable organisms where the testes remain in the abdomen are the elephant and the whale. In these species, the internal body temperature is conducive to sperm production, negating the need for external testes.

4. **Conclusion**: Based on the information, the organism in which the testes remain in the abdomen and do not descend into the scrotum is the elephant.

**Final Answer**: The correct answer is the elephant.

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