Question

The extra embryonic membrane that involve in the formation of the placenta in human is :

• A. Chorion
• B. Allantois
• C. Yolk sac
• D. Amnion

Answer 1

The correct option is A

Chorion

The correct option is (A):-

Explanation for the correct option:

1. The placenta is defined as the organ that will develop during the pregnancy in the mammals.
2. The placenta will actually provide Oxygen as well as nutrients to the growing fetus in the uterus of the mother.
3. Chorion is made up of the trophoblast from the outside and of extra-embryonic mesoderm from the inside.
4. So, the extra embryonic membrane which is involved in the formation of the placenta in human is chorion.

Explanation for the incorrect options:-

Option (B):

1. It is basically an extra -embryonic membrane in the reptiles, birds as well as the mammals.
2. The main function of the allantois is just to collect the liquid waste from the embryo as well as for the exchange of gases that are used by the embryo.

Option (C):

1. It is basically a structure that will develop inside the uterus in the pregnancy duration.
2. It is mainly digestive in function so acts as extra embryonic gut.
3. It also absorbs the dissolved yolk and passes it to developing embryo.
4. In human beings, it is vestigial.

Option (D):- Amnion

1. The amnion basically contains the thin, transparent fluid in which the embryo is suspended .
2. It provides the cushion against the mechanical injury.

Final answer: The extra embryonic membrane that involve in the formation of the placenta in human is chorion.