The diagram shows an experiment that was set up as a model to show why food needs to be digested. The Visking tubing acts as a model of the small intestine because it has tiny holes in it that some molecules can pass through. The tubing was left in the boiling tube for an hour, then the water in the tube was tested for starch and glucose.

a Describe how you would test the water for starch, and for glucose. What would the results be for a 'positive' test in each case?

b The tests showed that glucose was present in the water, but starch was not. Explain why.

c If the tubing takes the place of the intestine, what part of the body does the water in the boiling tube represent?

d What does 'digested' mean? distilled water mixture of starch and glucose Visking tubing bag


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