Two test tubes contain water and rice: A contains boiled rice, while B contains boiled and chewed rice. Iodine solution is added to both. Why does blue colour not appear in test tube B?

Question

Two test tubes contain water and rice: A contains boiled rice, while B contains boiled and chewed rice. Iodine solution is added to both. Why does blue colour not appear in test tube B? — Exam MCQ

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C. Starch was digested by salivary amylase — Salivary amylase breaks down starch during chewing. With starch digested, the blue-black starch-iodine colour does not develop. The source diagram is described in the question text.

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A. Starch was digested by pepsin in saliva

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B. Starch was digested by trypsin in saliva

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D. Starch was digested by lipase in saliva

Two test tubes contain water and rice: A contains boiled rice, while B contains boiled and chewed rice. Iodine solution is added to both. Why does blue colour not appear in test tube B?

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