Sample 1Easy
Androgens in the human testis are synthesised and secreted by
- A
Sertoli cells
- B
Leydig cells
- C
spermatogonia
- D
spermatids
Show the answer
The answer is B.The regions outside the seminiferous tubules contain small blood vessels and interstitial cells or Leydig cells. Leydig cells synthesise and secrete testicular hormones called androgens.
- A.
Sertoli cells provide nutrition to the germ cells.
- C.
Spermatogonia are male germ cells that form primary spermatocytes.
- D.
Spermatids are haploid cells that transform into sperms.
NCERT: Class 12 Biology, Chapter 2 (Human Reproduction), The Male Reproductive System
Sample 2Medium
A transverse section of a seminiferous tubule shows germ cells at different stages, from spermatogonia near the basal wall to spermatids near the lumen, together with large cells X that extend from the base towards the lumen in contact with the germ cells. Outside the tubule, in the interstitial spaces near blood vessels, lie small groups of cells Y. Which statement is correct?
- A
X are Sertoli cells that nourish the germ cells; Y are Leydig cells that synthesise androgens
- B
X are Leydig cells that nourish germ cells; Y are Sertoli cells that secrete androgens
- C
X are spermatogonia that divide by meiosis; Y are Sertoli cells
- D
X are primary spermatocytes; Y are immunocompetent cells that secrete testosterone
Show the answer
The answer is A.Seminiferous tubules are lined by male germ cells and Sertoli cells, which provide nutrition to the germ cells. The interstitial spaces outside the tubules contain Leydig cells, which synthesise and secrete androgens.
- B.
The labels are reversed: Sertoli cells lie inside the tubule, Leydig cells outside it.
- C.
Spermatogonia are germ cells near the base; Sertoli cells are inside, not in the interstitium.
- D.
X are the supporting nurse cells, and androgens come from Leydig cells.
NCERT: Class 12 Biology, Chapter 2, 2.1
Sample 3NEET level
Match List I with List II. List I: A. Sertoli cells B. Leydig cells C. Spermiogenesis D. Spermiation List II: I. Synthesis and secretion of androgens II. Nutrition of the male germ cells III. Transformation of spermatids into spermatozoa IV. Release of sperms from the seminiferous tubules Choose the correct answer.
- A
A-I, B-II, C-III, D-IV
- B
A-II, B-I, C-III, D-IV
- C
A-II, B-I, C-IV, D-III
- D
A-I, B-II, C-IV, D-III
Show the answer
The answer is B.Sertoli cells in the seminiferous tubules provide nutrition to the germ cells, while the interstitial Leydig cells synthesise and secrete androgens. Spermatids are transformed into spermatozoa by spermiogenesis, and the sperm heads are finally released from the seminiferous tubules by spermiation.
- A.
Swaps the Sertoli and Leydig cells: Leydig cells make androgens, Sertoli cells nourish germ cells.
- C.
Swaps spermiogenesis and spermiation: spermiogenesis forms spermatozoa, spermiation releases them.
- D.
Swaps both pairs: the cell functions and the two processes.
NCERT: Class 12 Biology, Chapter 2 (Human Reproduction), The male reproductive system and Gametogenesis