Q4. Arrange in the order in which sperms pass through them: epididymis, rete testis, vas deferens, vasa efferentia, urethra, ejaculatory duct.
Rete testis → vasa efferentia → epididymis → vas deferens → ejaculatory duct → urethra (NCERT page 27).
Q5. Write two major functions of the testis. (NCERT Exercise 4, first part)
It produces the sperms, in its seminiferous tubules, and it secretes the male hormones, androgens, from its Leydig cells (NCERT page 27).
Q6. Why are the testes in the scrotum, outside the abdominal cavity?
The scrotum keeps them 2–2.5 °C below the normal internal body temperature, a lower temperature that spermatogenesis needs (NCERT page 27).
Q7. Mark each true or false, and correct the false one: (a) spermatozoa get nutrition from Sertoli cells; (b) Leydig cells are found in the ovary; (c) Leydig cells synthesise androgens. (NCERT Exercise 16 b–d)
(a) True: Sertoli cells provide nutrition to the germ cells. (b) False: Leydig cells are in the interstitial spaces of the testis. (c) True (NCERT page 27).
Q8. Fill in the blanks: (a) Humans reproduce ____ (asexually/sexually). (b) Humans are ____ (oviparous, viviparous, ovoviviparous). (NCERT Exercise 1 a and b)
(a) Sexually. (b) Viviparous (NCERT page 26).