When a fertilised egg E formed in the oviduct of a human female divide repeatedly to from 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 net 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 in 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?

Answer

(a)Zygote (b) Placenta (c) Umbilical cord (d) From mother's blood to embryo : Oxygen and Nutrients ; From embryo to mother's bool : Waste (e) S (umbilical cord) is tied ct ; To separate the new borb baby from the mother