The part that supplies food from the mother to the foetus is

Analyze the question: The question asks which part supplies food (nutrients) from the mother to the foetus. The key idea is where the exchange between the mother's blood and the foetus's blood happens.

Explain the concept: During pregnancy, the foetus cannot feed itself, so it depends on the mother. Here is what each structure does:

• Amnion: A membrane that encloses the amniotic fluid. The fluid cushions the foetus and protects it from shock and temperature changes. It does not supply food.
• Chorion: The outer foetal membrane. It contributes to the formation of the placenta, but it is not the organ that supplies food.
• Umbilical cord: The tube that connects the foetus to the placenta. It carries nutrients and oxygen to the foetus, and carries waste (CO₂, urea) away. It is only the transport channel, not the source of the supply.
• Placenta: A disc-shaped organ attached to the uterine wall. Here the foetal blood and maternal blood come very close (without mixing). Food substances (glucose, amino acids, vitamins, minerals), oxygen, and antibodies pass from the mother to the foetus by diffusion and active transport. Waste products pass the other way.

Solution:

1. The question asks for the part that supplies food from mother to foetus.
2. The exchange of nutrients takes place at the placenta.
3. The umbilical cord only carries what the placenta has transferred.
4. So the placenta is the correct answer.

Answer: D. Placenta.

Exam tip: Remember "Placenta = Provider" (food, oxygen, antibodies), while "Cord = Conveyor" (it carries things), and "Amnion = Airbag" (it cushions the foetus). If an option is the organ where exchange happens, choose it over the tube that only transports.