Science (086) — AI-generated practice question

The placenta is a special disc-shaped tissue embedded in the uterine wall. It plays the following roles:

1. Nutrition: It transfers glucose and oxygen from the mother's blood to the embryo through villi, which provide a large surface area for exchange.
2. Waste removal: Waste substances produced by the developing embryo are transferred into the mother's blood through the placenta for elimination.
3. Connection: It connects the embryo to the uterine wall, allowing the embryo to receive all necessary nourishment from the mother throughout the approximately nine months of development.

Source: Chapter 7, Section 7.3.3(b)

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Examiners expect three distinct functions for 3 marks — typically: (1) nutrient/gas transfer, (2) waste removal, and (3) the structural role connecting embryo to uterus. Mention villi and blood spaces to show textbook accuracy. Avoid writing a vague one-liner like "it provides nutrition" — split the functions clearly. The approximate 3-point structure maps directly to the 3 marks awarded.