'The colour that is associated with a positive iodine test is

Assessment: WAEC SSCE - Biology - 2007 (Objective) Subject: Biology

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'The colour that is associated with a positive iodine test is
Answer Details
The colour that is associated with a positive iodine test is blue-black. Iodine is often used as a reagent to test for the presence of starch in a substance. When iodine comes into contact with starch, it forms a complex that has a blue-black colour. Therefore, if the substance being tested contains starch, a positive iodine test will result in the blue-black colour. If there is no starch present, then the colour will remain unchanged.
Read lesson note on Genetic Terminologies (WAEC)
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