PART - 2 CH - 7 How do Organisms Reproduce ? — Science STD 10 — Question

Placenta: The embryo gets nutrition from the mother's blood with the help of a special tissue called placenta. It is a disc-like structure which is embedded in the uterine wall. It contains villi on the embryo's side of the tissue. On the mother's side there are blood spaces, which surround the villi. This provides a large surface area for passage of glucose and oxygen from the mother to the embryo. The developing embryo also generates waste substances which can be removed by transferring them into mother's blood through the placenta.