In human beings, the implantation of fertilised egg takes place in which part of female reproductive system?

As per the chapter: "The fertilised egg (zygote) starts dividing and form a ball of cells or embryo. The embryo is implanted in the lining of the uterus where they continue to grow and develop organs to become foetus." The uterus lining thickens every month and becomes richly supplied with blood specifically to receive and nourish this implanted embryo, so (C) is correct.

Why the distractors fail: (A) Oviduct (fallopian tube) is only the site of fertilisation — the egg travels from the ovary through the oviduct to the uterus, but the zygote does not implant there. (B) Cervix is merely the narrow opening connecting the uterus to the vagina, not the site of embryo growth. (D) Vagina is the passage through which sperms enter and through which the baby is later born; it plays no role in implantation.