The correct option is A Fertilisation – P, implantation – R
P, Q, R and S are the fallopian tube, ovary, uterus and vagina respectively.
In the process of fertilisation, a mature ovum is released from either one of the ovaries. The sperm or the male gamete travels into the uterus and into the fallopian tube where the fertilisation takes place. After the fusion of the male and the female gamete, a fertilised egg or the zygote is formed. Gradually this zygote gets implanted into the wall of the uterus where the baby develops and gets its nourishment from the mother.