$(a)$ Draw a sectional view of the human female reproductive system and label the parts where:
$(i)$ eggs develop.
$(ii)$ fertilization takes place.
$(iii)$ the fertilized egg gets implanted.
$(b)$ Describe,in brief,the changes the uterus undergoes:
$(i)$ to receive the zygote.
$(ii)$ if the zygote is not formed.

(N/A) Diagram: Refer to the sectional view of the human female reproductive system in the textbook.
Labels:
$(i)$ Ovary: The site where eggs (ova) develop.
$(ii)$ Fallopian tube (Oviduct): The site where fertilization takes place.
$(iii)$ Uterus: The site where the fertilized egg (embryo) gets implanted.
$(b)$ $(i)$ To receive the zygote,the inner lining of the uterus (endometrium) becomes thick,soft,and richly supplied with blood vessels to nourish the developing embryo.
$(ii)$ If the zygote is not formed,the thickened uterine lining is no longer needed. It breaks down and is shed along with blood and mucus through the vagina,a process known as menstruation.