Match List - I with List - II.

Choose the correct answer from the options given below:

(A)-(III), (B)-(II), (C)-(IV), (D)-(I)

The correct answer is Option (3) → (A)-(III), (B)-(II), (C)-(IV), (D)-(I)

A. Each seminiferous tubule is lined on its inside by two types of cells called male germ cells (spermatogonia) and Sertoli cells. The male germ cells undergo meiotic divisions finally leading to sperm formation, while Sertoli cells provide nutrition to the germ cells.

B. The male accessory glands include paired seminal vesicles, a prostate and paired bulbourethral glands. Secretions of these glands constitute the seminal plasma which is rich in fructose, calcium and certain enzymes. The secretions of bulbourethral glands also helps in the lubrication of the penis.

C. The scrotum is a sac-like structure located outside the body, below the penis, containing the testes. Its position outside the body helps regulate the temperature of the testes. The testes need to be maintained at a slightly lower temperature than the rest of the body for the proper production and maturation of sperm. The scrotum helps in maintaining the low temperature of the testes (2–2.5^oC lower than the normal internal body temperature) necessary for spermatogenesis.

D. The regions outside the seminiferous tubules called interstitial spaces, contain small blood vessels and interstitial cells or Leydig cells. Leydig cells synthesise and secrete testicular hormones called androgens.