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Q134. Which of the following inhibits the growth of the paramesonephric duct (males)? A) Testosterone B) Leydig Cells C) Dihydrotestosterone D) Estrogens E) Mullerian substances (MIFs) Correct answer: E) Mullerian substances (MIFs) Explanation: Sertoli cells produce Mullerian Inhibiting Factor (MIF), causing paramesonephric duct regression. Testosterone A) maintains the mesonephric duct, not paramesonephriC) — Q136. The epididymis, ductus deferens, ejaculatory duct, and seminal vesicle all arise from: A) The Mullarian ducts B) The paramesonephric ducts C) The mesonephric ducts D) Leydig hormones E) Wolffian hormones Correct answer: C) The mesonephric ducts Explanation: Male genital ducts derive from mesonephric (Wolffian) ducts under testosterone stimulation. Paramesonephric ducts (A,B) regress in males. — Q137. The uterine tubes, uterus, cervix, and superior part (1/3) of the vagina all arise from: A) The Wolffian ducts B) The paramesonephric ducts C) The mesonephric ducts D) Leydig hormones E) Mullarian hormones Correct answer: B) The paramesonephric ducts Explanation: Female reproductive structures develop from fused paramesonephric (Mullerian) ducts. The lower vagina forms from the urogenital sinus. Check for Duplicates