A student performed tests on food substances A, B and C and made the following observations
| Food substance | Test | Observation |
| A | Few drops of iodine solution was added to A | The iodine solution turns blue-black |
| B | A drop of B was applied to a white sheet of paper | A translucent patch was seen on the paper |
| C | Benedict's solution was added to C and the mixture boiled | Benedicts's solution turns from blue to brick-red |
(i)
Identify food substances A, B and C.
(ii)
Give the products of digestion of A, B and C
(iii)
In which parts of the alimentary canal does the digestion of each of food substances A, B and C start?
(iv)
In which part of the alimentary canal is food substance C absorbed after digestion?
In an experiment, yam pap is put into two test tubes A and B containing iodine solution.
The test tubes are warmed slightly to a temperature of 37oC and saliva is put into test tube B.
(i)
State the colour of the content of the test tube A.
(ii)
State the colour changes of the contents in test tube B after 3 minutes.
(iii)
Fehling's solution is added to the contents of test tube B after the 3 minutes and it turns brick-red. What food substance is present?
(iv)
Give two functions of saliva in eating.
(v)
Why was it necessary to warm the contents of the test tubes to about 37oC?
(vi)
Give two aims of the experiment.
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