<prompt> Which of the following is a true statement:Placenta is formed at morula stageImplantation takes place on 10th dayDuring initial weeks corpus luteum survival is due to LHFertilization takes place in ampula  <response>: Ans. d Fertilization takes place in ampulaRef.: D.C. Dutta 8th ed. 32-36, 7th ed. 121-22Option A-Placenta is formed by trophoblast which 1st appear at blastocyst stage, hence option A is wrong.Option B-Implantation takes place on 6th day.Option C-During initial weeks corpus leuteum surviaval is due to HCG, not due to LH.Option D-site of fertilization is ampulla. 