O-LevelBiologyHuman Nutrition5090/11 · May/June 2023 · Q131 Mark
An investigation is carried out on digestion and absorption in the alimentary canal. The diagram shows the apparatus used. The Visking tubing is permeable to small molecules such as glucose but not to large molecules such as starch. After one hour, samples of water in the beaker are tested with Benedict's solution and with iodine solution. Which colours are obtained?
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Acolour obtained after heating with Benedict's solution: blue, colour obtained after adding iodine solution: blue-black
Bcolour obtained after heating with Benedict's solution: blue, colour obtained after adding iodine solution: yellow-brown
Ccolour obtained after heating with Benedict's solution: red, colour obtained after adding iodine solution: blue-black
Dcolour obtained after heating with Benedict's solution: red, colour obtained after adding iodine solution: yellow-brown
✓ Correct answer
D: colour obtained after heating with Benedict's solution: red, colour obtained after adding iodine solution: yellow-brown
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