NEET BIOLOGY

Detailed explanation-1: -Then the zygote travels down the fallopian tube, where it becomes a morula. Once it reaches the uterus, the morula becomes a blastocyst . The blastocyst then burrows into the uterine lining-a process called implantation.

Detailed explanation-2: -In an ectopic pregnancy, the egg attaches itself somewhere outside the uterus-usually to the inside of a fallopian tube.

Detailed explanation-3: -Implantation (nidation) is the stage in the embryonic development of mammals in which the blastocyst hatches as the embryo, adheres, and invades into the wall of the female’s uterus.

Detailed explanation-4: -The germinal stage ends when the blastocyst implants in the endometrium of the uterus (days 8-9). After implantation occurs, the blastocyst is called an embryo, and it will soon obtain nutrients from the mother’s blood via a temporary organ called the placenta.