Question

Give reason we boil the leaf in alcohol when we are testing it for starch

Answer 1

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.

hope this answer will help u

Answer 2

hey here is you answer....
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bcoz alcohol (rectified spirit) contain strong acids,and it kills the cells of starches and the leaf becomes blue-black.
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hope it helps