Secretions of which structure is not essential for the maturation and…

The correct answer is Option (3) → Ureter

Sperms leave the testis immature. On their way out they pass through the male accessory ducts (epididymis, vas deferens) and receive the secretions of the accessory glands (seminal vesicles, prostate).

Option (1) Epididymis — Essential for sperms. The epididymis stores the sperms, and its secretion helps them mature.

Option (2) Vas deferens — Essential for sperms. This duct carries sperms from the epididymis towards the urethra, and its secretion is part of the sperms’ maturation.

Option (3) Ureter — Not essential for sperms. The ureter is part of the excretory system. It carries urine from the kidney to the urinary bladder and has nothing to do with sperms.

Option (4) Seminal vesicle — Essential for sperms. It adds a fluid rich in fructose, which gives sperms energy for swimming, to the seminal plasma.

NCERT Extract:
Gametogenesis – “… Sperms released from the seminiferous tubules, are transported by the accessory ducts. Secretions of epididymis, vas deferens, seminal vesicle and prostate are essential for maturation and motility of sperms. The seminal plasma along with the sperms constitute the semen.”