Write the name of the structure which provides nutrition to the embryo from mother's blood.

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Solution

The placenta is the structure which attaches the developing embryo with the mother. This is the structure which is attached to the umbilical cord of the embryo. The placenta helps to provide nutrition to the embryo. This structure also carries oxygen to the embryo and the wastes away from the embryo.

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Q. The attachment of developing embryo to the uterus of mother to obtain nutrition is called:

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?

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