Functions of the Testis

$\to$ They produce male gametes called spermatozoa by the process of spermatogenesis.

$\to$ The leydig cells of the seminiferous tubules secrete the male sex hormone called testosterone. Testosterone aids the development of secondary sex characteristics in males

Functions of the ovary

$\to$They produce female gametes called ova by the process of oogenesis.

$\to$The growing Graffian follicles secrete the female sex hormone called estrogen. Estrogen aids the development of secondary sex characteristics in females.