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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?
Colourless
Green
Blue
White
- Initially, the leaf is boiled in water to kill the cells, making them permeable.
- Boiling in alcohol removes chlorophyll, turning the leaf colorless or pale.
- The leaf is then treated with iodine solution.
- Iodine tests for the presence of starch by turning blue-black.
- If photosynthesis had occurred, starch would be present in the leaf.
- An immersed leaf in iodine would turn blue-black due to starch presence.
Option:3 - Blue.
By: Parvesh Mehta ProfileResourcesReport error
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