1. A leaf was plucked from a plant on a sunny day and kept for 2 minutes in boiling water. It was subsequently immersed in boiling alcohol and treated with iodine solution what will be the final colour of the leaf after the test?
Explanation
Since the leaf was plucked on a sunny day it is presumed that starch is present. The leaf is immersed in boiling water and alcohol to remove chlorophyll. If starch is present the iodine will turn the colour of the leaf to blue.