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Question
When carrying out the starch test on a leaf, why is it important to boil the leaf in alcohol?
Options
to dissolve the waxy cuticle
to make the cells more permeable to iodine solution
to remove the chlorophyll
to stop chemical reactions in the cells
MCQ
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Solution
to remove the chlorophyll
Explanation:
Boiling the leaf in alcohol specifically extracts the green pigment (chlorophyll), turning the leaf pale or white. This is an essential step because the dark green colour would otherwise mask the distinct blue-black colour change indicating the presence of starch when iodine solution is added.
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