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In Activity 5.1 (the starch test on a variegated leaf), the leaf is dipped in boiling water and then in alcohol mainly to:

Question
In Activity 5.1 (the starch test on a variegated leaf), the leaf is dipped in boiling water and then in alcohol mainly to:
Kill the leaf and remove chlorophyll for clearer colour observation
Add starch to the leaf
Add iodine to the leaf
Increase photosynthesis
Answer
Kill the leaf and remove chlorophyll for clearer colour observation
Detailed Explanation
Boiling in water softens the leaf and boiling in alcohol removes the chlorophyll, making the colour change with iodine easier to observe.
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