(a) Name the hormone that initiates spermatogenesis in humans. Describe the process of spermatogenesis in 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.

Explanation

(b) (i) Head
(ii) Neck
(iii) Middle piece
(iv) Tail