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.

(c) Name the string-like structure S?

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Solution

S is the umbilical cord which is a string-like structure that connects the embryo with the placenta in the mother’s body.

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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?

Name the following :

(a) The fluid surrounding the developing embryo.

(b) The body part in which the embryo develops.

(d) the canal through which the testes descend into the scrotum just before birth in human male child.

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

Q. . Which embryo is more likely to survive? Why?
a. An embryo that develops inside its mother.
b. An embryo that develops outside in the environment

Q. Which of the following is/are true/false regarding the development of an embryo?
(i) An embryo is made up of many cells.
(ii) The stage of development in which all the body parts can be identified is called as the foetus.
(iii) The stage of development in which the cells begin to form groups that develop into different tissues and organs of the body is called the embryo.
(iv) The embryo gets nutrition from the uterus.

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​S is the umbilical cord which is a string-like structure that connects the embryo with the placenta in the mother’s body.

S is the umbilical cord which is a string-like structure that connects the embryo with the placenta in the mother’s body.