Question

(a) Name the hormone that initiates spermatogenesis in humans. Describe the process of spermatogenesis in sequence mentioning the ploidy of the cells at each step.
(b) Draw the diagram of a mature human sperm and label the parts that
(i) helps it reaching to the ovum.
(ii) providing energy for it to reach the ovum.
(iii) helping it to gain entry into the ovum.

Answer 1

Answer:

Testosterone

Explanation:

Answer 2

Spermetogenesis in humans

Explanation:

(a) Gonadotropin-releasing hormone/GnRH.  

• Process of spermatogenesis:  

• The spermatogonia (present on the inside wall of seminiferous tubules) are diploid (2N).  

• Primary spermatocytes undergo Ist meiosis leading to the formation of two equal haploid cells (N) called secondary spermatocyte.  

• The secondary spermatocytes undergo the second meiotic division to form 4 equal haploid (N) Spermatids.  

• Now spermatids transform into spermatozoa (N)

 b) Correct diagram :  

  (i) Tail  

  (ii) Middle piece/mitochondria  

  (iii) Acrosome