Generated by claude-sonnet-4-6 · 2026-06-15 06:41 · grounding rag
Model Answer
Villi are tiny, finger-like projections found on the embryo's side of the placenta. They are surrounded by blood spaces on the mother's side. Villi provide a large surface area for the transfer of glucose and oxygen from the mother's blood to the developing embryo, and for removal of waste substances from the embryo.
Source: Chapter 7, Section 7.3.3(b)
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Explanation
- The question is directly answered from the placenta passage in Chapter 7.
- Examiners expect two things: what villi are (finger-like projections) and where they are found (embryo's side of the placenta) — one point each for 2 marks.
- Mentioning their function (large surface area for exchange) strengthens the answer and is often expected even in a "what/where" question.
- Do not confuse these with intestinal villi (Class 10 Life Processes chapter) — the source passage here refers only to placental villi.