Science — AI-generated practice question

Bile juice is secreted by the liver and released into the small intestine. It performs two key roles in fat digestion:

1. Neutralisation: Food arriving from the stomach is acidic. Bile makes it alkaline, creating the right pH for pancreatic enzymes to act.

1. Emulsification: Fats are present as large globules in the intestine, making it difficult for enzymes to act on them. Bile salts break these into smaller globules (emulsification), greatly increasing the surface area and the efficiency of the enzyme lipase (from pancreatic juice), which then digests the emulsified fats into fatty acids and glycerol.

Source: Life Processes, Section 5.2.4 – Nutrition in Human Beings

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Examiners expect two distinct points: neutralisation (making the medium alkaline) and emulsification of fats. Many students lose marks by mentioning only one. Note that bile is produced by the liver (not pancreas), and the enzyme that actually digests fats is lipase — bile itself is not an enzyme. Linking emulsification to increased enzyme efficiency is a scoring line. The analogy to soap emulsifying dirt (from the text) can be added but is not required.