Science (086) — AI-generated practice question

Villi are numerous finger-like projections on the inner lining of the small intestine. They increase the surface area available for absorption of digested food.

Their structure suits their function in two key ways:

• The large number of villi greatly increases the surface area, allowing more digested food to be absorbed quickly.
• Villi are richly supplied with blood vessels, which transport the absorbed food (glucose, amino acids, fatty acids, glycerol) to every cell of the body for energy, growth, and repair.

Source: Chapter 5, Section 5.2.4 – Nutrition in Human Beings

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The examiner expects two clear points: (1) villi increase surface area and (2) they contain blood vessels for transport. Many students mention only the first point and lose a mark. Use the exact textbook phrase "finger-like projections" and "richly supplied with blood vessels." Since it is 3 marks, three distinct ideas (what villi are + surface area + blood supply/function) earn full credit.