CAIE IGCSE Biology 7.4.6 Digestion of Starch in the Digestive Questions
Practise tracing starch digestion as amylase makes maltose and maltase on the small-intestine epithelial membrane converts it to glucose.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- Describe how amylase converts starch to maltose and maltase converts maltose to glucose.
- Locate maltase on the epithelial membranes lining the small intestine.
CAIE IGCSE Biology 7.4.6 Digestion of Starch in the Digestive Questions question 1
[Maximum number: 6]
Starch and sucrose are made by plants after photosynthesis.
Describe how starch is broken down in the human digestive system so that it can be absorbed into the blood.
any six from:
1 (starch is broken down by) physical / mechanical, digestion ;
2 (physical digestion / AW) uses teeth / occurs in the, mouth / (involves churning) in stomach ;
3 (physical digestion) increases surface area (for faster enzyme activity) ;
4 chemical digestion / break down (of insoluble molecules) into (smaller) soluble molecules (by enzymes) ;
5 salivary glands / pancreas, secrete / make, amylase ;
6 amylase (breaks down) starch to maltose ;
7 maltase is found on epithelium (lining) of, small intestine / duodenum / ileum ;
8 (maltase) breaks down maltose to glucose ;
9 (optimum) pH for, amylase / maltase / carbohydrase is, neutral / 7/8 ;
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