Blastocyst implantation close to internal os causes-: (A) Placenta previa, (B) Placenta Percreta, (C) Placenta increta, (D) Abruptio
Answer is A. Ans. is 'a' i.e., Placenta Previa Placenta Previao When the placenta is implanted partially or completely over the lower uterine segtnent, over and adjacent to the internal os, it is called placenta previa.