<prompt> What is true about spermatogenesis?It takes 74 daysTakes place in spermatic cordMeiosis occurs only after secondary spermatocyteSpermatid is formed from spermatozoa  <response>: Ans. A It takes 74 daysRef: Textbook of Human Embroyology, pg. 24 Spermatogenesis - Process of formation of spermatozoa from primitive germ cell spermatogonia Spermiogenesis - Formation of spermatozoa from spermatid. Spermatogenesis begins at-puberty oogenesis begins intrauterine life Spermatogenesis continues-throughout life oogenesis- stops at menopause Average time-74 days Site- seminiferous tubule Sperm size- 55-65 pm Parts- head, neck, middle piece, principal piece, end piece. Acquire motility in- epididymis. 