Science (086) — AI-generated practice question

The placenta is a special disc-like tissue embedded in the uterine wall that connects the embryo to the mother. It has villi on the embryo's side, surrounded by blood spaces on the mother's side, providing a large surface area for exchange.

Its roles are:

1. Nutrition: Glucose and oxygen pass from the mother's blood to the embryo through the placenta.
2. Waste removal: Waste substances produced by the embryo are transferred into the mother's blood through the placenta for elimination.

Source: Chapter 7, Section 7.3.3(b) – Female Reproductive System

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Examiners expect three clear functional points for 3 marks:

• Structure of placenta (disc embedded in uterine wall, villi, blood spaces) — sets context.
• Nutrient/gas transfer (glucose + oxygen from mother to embryo).
• Waste removal (embryo's waste transferred to mother's blood).

Avoid vague statements like "it helps the baby grow." Use correct terms: villi, blood spaces, uterine wall. These specific terms earn marks. The answer should be concise — around 70–80 words is ideal for 3 marks.