When a placenta is first developed,it transfers nutrients and oxygen from mother to
A) egg cell.
B) fetus.
C) embryo.
D) zygote.

Question

Quizplus · Accepted Answer

The placenta is a specialized organ that forms during pregnancy and is responsible for transferring nutrients and oxygen from the mother to the developing embryo/fetus. At the time of placental development, the zygote has not yet implanted into the uterine wall and is not yet considered an embryo. Therefore, option D is incorrect. Option A can also be eliminated as egg cell is the starting point of fertilization, but after fertilization, the cell becomes a zygote. Hence, option B is also incorrect since it mentions fetus, which is a later stage of development. The best answer is therefore C) embryo, as this correctly identifies the stage of development when the placenta begins to transfer nutrients and oxygen.

When a Placenta Is First Developed,it Transfers Nutrients and Oxygen