Given below is a diagrammatic sketch of a portion of human male reproductive system. Which of the following part contributes to the maximum portion of semen?

Which of the following depicts the site of implantation of blastocyst under normal condition?

Study the flow chart. Name the hormones labelled as $\mathrm{A}, \mathrm{B}, \mathrm{C}, \mathrm{D}$ at each stage.

Choose the correct option.

Given below are four statements $\left(\mathrm{A}-\mathrm{D}\right)$ each with one or two blanks. Select the option which correctly fill up the blanks in two statements:
A. The human male ejaculates about (i) million sperms during a coitus. Out of which, for normal fertility at least
(ii) percent sperms must have normal shape and size.

B. A primary spermatocyte completes
(i) meiotic division leading to the formation of two equal haploid cells called (ii)
C. Spermatogenesis starts at the age of (i) due to significant increase in the secretion of (ii) a hypothalamic hormone.
D. Oogenesis is initiated during embryonic development and at puberty only
(i) primary follicles are left in each ovary.

Which of the following labelled parts produces energy for the movement of the tail that facilitates sperm motility essential for fertilisation?