___________ is a disc shaped structure attached to the uterine wall and is a temporary association between the developing embryo and maternal tissues.

Allontois

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Placenta

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Chorion

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Amnion

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Solution

The correct option is B Placenta
The placenta is a disc shaped structure attached to the uterine wall and is a temporary association between the developing embryo and maternal tissues. It allows the exchange of food materials, diffusion of oxygen, excretion of nitrogenous wastes and elimination of carbon dioxide.

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Similar questions

When a fertilised egg E formed in the oviduct of a human female divide repeatedly to form an embryo, the embryo gets implanted in the thick and soft lining of the uterus. After this, a disc-like special tissue T develops between the uterus wall and embryo through which all the requirements of the developing embryo (and foetus) are met from the mother's body. The embryo is connected to the tissue T through a string like structure S.
(a) What is the other name of fertilised egg cell E?
(b) What is the name of tissue T?
(c) Name the string-like structure S.
(d) Name two substances which pass from mother's blood to embryo through tissue T and, one type of substance which passes from embryo to mother's blood.
(e) What happens to S when the baby is born? Why?

Q. When a fertilised egg E formed in the oviduct of a human female divides repeatedly to form an embryo, the embryo gets implanted in the thick and soft lining of the uterus. After this a disc-like special tissue T develops between the uterus wall and embryo through which all the requirements of the developing embryo (and foetus) are met from the mother's body.

The embryo is connected to the tissue T through a string like structure S.

Q. Which of the following is correct about placenta?
A. It is a disc-like structure embedded in the wall of the uterus.
B. It is richly supplied with blood and has villi on the embryo side.
C. Foetus gets nutrients, oxygen, etc. from the maternal blood and gives off wastes,

C O_{2}

, etc.
D. It is the connecting link between the uterine wall of the mother and the foetus.

Give a one-word answer:

Attachment of embryo to the uterine wall.

Q. The structural and functional unit between developing embryo (foetus) and maternal body is called

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