Question

Choose the correct answers from the alternatives given.
In implantation which of the following burrows into the endometrium
A.Zygote
B.Blastocyst
C.Gastrula
D.Morula

Answer 1

The attachment of the embryo to the wall of the uterus for deriving nutrition from the maternal body is termed as the implantation of the embryo.

Complete answer:
1)Implantation is one of the stages of pregnancy in which the embryo in its blastocyst form gets attached to the uterus wall which connects the embryo to its mother and this connection helps in the transfer of oxygen and other nutrients from the body of the mother to the embryo that helps the embryo to survive and grow properly.
2)The fertilization results in the formation of a zygote that undergoes cleavage, which leads to the formation of a structure known as morula which has outer cell mass and the inner cell mass. The outer cell mass forms the trophoblast and the hollow region present inside the morula is known as the blastocoel. The morula divides continuously to form a blastocyst that burrows in the endometrium.

Option B: Blastocyst burrows the endometrium in implantation.Therefore, this is the correct option.

All other options are irrelevant.

Hence, the correct answer is option (B)

Note: Mostly in humans during the implantation the burrowing of the blastocyst into the endometrium occurs within 9-12 days after the ovulation. The period where the endometrium is ready to receive the blastocyst is known as the implantation window period. In this implantation, window endometrium undergoes many changes to facilitate proper implantation.