$(a)$ Name the human male reproductive organ that produces sperms and also secretes a hormone. Write the functions of the secreted hormone.
$(b)$ Name the parts of the human female reproductive system where:
$(i)$ fertilisation takes place.
$(ii)$ implantation of the fertilised egg occurs. Explain how the embryo gets nourishment inside the mother's body?

(N/A) The human male reproductive organ is the $Testis$. It secretes the hormone $Testosterone$.
Functions of $Testosterone$:
$(i)$ It regulates the production of sperms.
$(ii)$ It brings about the development of secondary sexual characteristics in males during puberty.
$(b)$ $(i)$ Fertilisation takes place in the $Fallopian tube$ (or $Oviduct$).
$(ii)$ Implantation occurs in the $Uterus$.
Nourishment of the embryo: The embryo receives nourishment from the mother's blood through a special tissue called the $Placenta$. The $Placenta$ is a disc-like structure embedded in the uterine wall. It provides a large surface area for the transfer of glucose, oxygen, and other essential nutrients from the mother's blood to the developing embryo, and also facilitates the removal of waste products produced by the embryo.