Biology for IGCSE & O level - Biological Molecules (Section 1 - No. 50)

What is the role of iodine solution in testing for starch?
It precipitates starch.
It reacts to form a blue-black complex with starch.
It breaks down the starch molecules.
It acts as a catalyst in the starch reaction.

Explanation

Iodine reacts with starch to produce a blue-black color.

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