Where is sperm first produced? Where do the sperm cells mature?

The correct answer will be - seminiferous tubules of scrotum.

Explanation:

Spermatogenesis is the process of formation of male gametes or sperms. The process begins when spermatogonia in seminiferous tubules divide by mitosis and meiosis I and becomes primary spermatocytes and meiosis II and form secondary spermatocyte.

The secondary spermatocyte differentiates into sperms where the large Sertoli cells nourish the immature sperm. The sperms get stored in the epididymis where also they get nourished.

Thus, seminiferous tubules of the scrotum are the correct answer.