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Question
In a test tube containing dilute starch, solution saliva is added kept at pH 2.8 and temp 38oC. After half an hour, a drop of iodine is added and it is found that solution turns
In a test tube containing dilute starch, solution saliva is added kept at pH 2.8 and temp 38oC. After half an hour, a drop of iodine is added and it is found that solution turns
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Solution
The correct option is B Colourless and sweet in taste
Saliva contains an enzyme salivary amylase which hydrolyzes starch into glucose. Starch gives blue black colour on addition of iodine solution but glucose does not gives positive result with iodine test. Hence, when starch is exposed to salivary amylase in saliva it does not gives blue black colour with iodine solution and tastes sweet due to glucose.
Saliva contains an enzyme salivary amylase which hydrolyzes starch into glucose. Starch gives blue black colour on addition of iodine solution but glucose does not gives positive result with iodine test. Hence, when starch is exposed to salivary amylase in saliva it does not gives blue black colour with iodine solution and tastes sweet due to glucose.
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