Final answer:
The cytotrophoblast doesn't become the fetus itself, but contributes to the fetal portion of the placenta and the nourishment of the growing embryo. It is the inner cell mass, or embryoblast, that ultimately develops into the fetus. Therefore, the statement is false.
Step-by-step explanation:
The question 'the cytotrophoblast is made of cells which later become the fetus True or False?' can be answered as follows. The cytotrophoblast is a layer of cells in the early embryonic stage that is part of the complexity of tissues joining the mother and the developing embryo. These cells contribute to the formation of the chorionic villi and the fetal part of the placenta, facilitating nutrient, waste, and gas exchange through the maternal blood flow.
However, it is the inner cell mass within the blastocyst, known as the embryoblast, that will actually develop into the embryo and eventually the fetus. So the statement that the cytotrophoblast cells themselves become the fetus is false. The cytotrophoblast and syncytiotrophoblast together form the trophoblast, which provides the nutrients necessary for the embryoblast and later establishes the placenta's connection to maternal tissues.