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

Explanation

### Step-by-Step Solution:

1. **Understanding Testicular Descent**: The testes are typically formed in the abdominal cavity during fetal development and descend into the scrotum before birth. This descent is crucial for normal reproductive function.

2. **Importance of Temperature for Spermatogenesis**: Spermatogenesis, the process of sperm production, requires a temperature that is lower than the normal body temperature (approximately 37°C). The ideal temperature for sperm production is around 34-35°C, which is achieved in the scrotum.

3. **Consequences of Undescended Testes**: When the testes fail to descend into the scrotum (a condition known as cryptorchidism), they remain at the higher body temperature. This elevated temperature is detrimental to the process of spermatogenesis.

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