Name the hormone responsible for the descent of testes into the scrotum. Why does the failure of the process result in sterility?

Explanation

Follicle stimulating hormone (FSH). Non descent of testes in scrotum causes sterility because spermatogenesis requires low temperature and inside the scrotum the temperature is 2-`2.5^@C` lower than the normal. This defect is usually cured by simple surgical process.