Arrange the following in the order of their occurrence.
(A) Spermatids are transformed into spermatozoa
(B) Spermatogonia are multiplied by mitotic division
(C) Sperms are released from seminiferous tubules by the process of spermiation
(D) Sperm heads are embedded in sertoli cells
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → (B), (A), (D), (C)
(B) Spermatogonia are multiplied by mitotic division — first. The sperm mother cells increase in number on the wall of the seminiferous tubules.
(A) Spermatids are transformed into spermatozoa — second. After the two meiotic divisions, the spermatids change into sperms (spermiogenesis).
(D) Sperm heads are embedded in sertoli cells — third. After spermiogenesis, the sperm heads become embedded in the Sertoli cells.
(C) Sperms are released from seminiferous tubules by the process of spermiation — last. The sperms are finally released into the tubule.
NCERT Extract:
Gametogenesis – “… The spermatogonia (sing. spermatogonium) present on the inside wall of seminiferous tubules multiply by mitotic division and increase in numbers. Each spermatogonium is diploid and contains 46 chromosomes.”
Gametogenesis – “… The spermatids are transformed into spermatozoa (sperms) by the process called spermiogenesis. After spermiogenesis, sperm heads become embedded in the Sertoli cells, and are finally released from the seminiferous tubules by the process called spermiation.”