<prompt> Largest size is:SpermatogoniumPrimary SpermatocyteSecondary spermatocyteSpermatozoa  <response>: Ans. b Primary SpermatocyteRef: I.B. Singh 9th ed. H4-15 Please refer to the image given about how spermatogonium undergoes mitotic division and forms primary spermatocyte, which further forms secondary spermatocyte and spermatic after first and 2nd meiotic division respectively. Microscopically primary spermatocyte is largest in size among all. The formation of spermatogonium to spermatozoa takes around 74 days. 