How can you test the presence of starch in a leaf? What do you conclude when white patches do not change blue-black on adding iodine solution?
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The hot water kills the leaf and the alcohol breaks down the chlorophyll, taking the green color out of the leaf. When you put iodine on the leaves, one of them will turn blue-black and the other will be a reddish-brown. Iodine is an indicator that turns blue-black in the presence of starch.
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