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.
(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 ?
(a) The other name of fertilised egg cell (E) is zygote.
(b) T is placenta.
(c) S is umbilical cord
(d) Nutrients and oxygen from mother’s blood to embryo; and waste substances from embryo to mother’s blood.
(e) When the baby is born, umbilical cord (S) is tied and then cut. It is done to separate the new born baby from the mother’s body.