Which statement is true about the function of the testes?

• A. The production of Seminal Fluid.
• B. Secretion of Testosterone.
• C. Maturation of ova.
• D. Spermatogenesis.

Answer: (D)

The key idea is that the main role of the testes is to produce sperm through spermatogenesis. This process occurs in the seminiferous tubules, where germ cells undergo division and maturation to become haploid spermatozoa that travel to the epididymis for final maturation and storage. This sperm-producing function is the essential reproductive output of the testes and directly ties to male fertility.

Seminal fluid, which combines with sperm to form semen, is mainly produced by accessory glands such as the seminal vesicles and prostate, not by the testes themselves. The testes do contribute to testosterone production via Leydig cells, which supports sexual characteristics and spermatogenesis, but the statement that best captures the testes’ direct, primary function in reproduction is spermatogenesis. Maturation of ova is a function of the ovaries, not the testes, so that option is not applicable.