Males in whom testes fail to descend to the scrotum are generally infertile. Why?

Explanation

### Step-by-Step Solution:

1. **Understanding Testicular Descent**: In normal male development, the testes descend from the abdominal cavity into the scrotum before birth. This process is crucial for proper reproductive function.

2. **Role of Temperature in Spermatogenesis**: Spermatogenesis, the process of sperm formation, requires a specific temperature that is lower than the body’s core temperature. The scrotum provides this cooler environment, which is essential for the development of healthy sperm.

3. **Impact of Undescended Testes**: When the testes fail to descend into the scrotum (a condition known as cryptorchidism), they remain in the warmer abdominal cavity. This higher temperature inhibits spermatogenesis.

...