The two crucial functions of the testis and ovary are
Testis:
The process of spermatogenesis through which the production of spermatozoa or sperm takes place.
Testosterone, the male sex hormone is essential for the development of testes that take place during puberty. Testosterone is secreted by the Leydig cells.
Ovary:
The production of eggs or ova through the process of oogenesis.
The generation of two main female sex hormones that are Progesterone and oestrogen that regulate aspects of sexual well-being and menstruation.