During the iodine test for starch in a leaf, the leaf is sequentially treated with boiling water, boiled in alcohol, and then dipped in iodine solution. What is the primary purpose of these biological steps and the resulting color change?

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Biology · Life Processes

Verified Solution4 OptionsUpdated: October 2026👁️1 View

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Boiling breaks cell membranes, alcohol removes chlorophyll to decolorize the leaf, and iodine turns starch-containing regions blue-black.

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Answer 1

Boiling breaks cell membranes, alcohol removes chlorophyll to decolorize the leaf, and iodine turns starch-containing regions blue-black.

Answer 2

Boiling disinfects the leaf surface, alcohol permanently stains the leaf green, and iodine destroys accumulated starch.

Answer 3

Boiling stiffens the cellular tissue, alcohol cleans oily residues, and iodine tests for the presence of proteins.

Answer 4

Boiling softens the leaf structure, alcohol rapidly evaporates to dry it, and iodine enhances natural pigments.

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