Colour changes of a leaf when testing for starch

1 answer:

5 0

The Iodine test can be used to determine whether leaves contain starch. The leaf's color changes to blue after the chlorophyll is removed by boiling it in alcohol and adding two drops of iodine solution, indicating the presence of starch.

Plants use photosynthesis to convert the raw resources they collect from their surroundings into nourishment. We can look into the prerequisites for this process as well as the variables that influence its speed.
To check for the presence of starch in leaves, an iodine solution is utilized. A plant leaf must be heated for 30 seconds in boiling water (this kills the leaf, stopping any chemical reactions)
The leaf should be placed in a water bath with boiling ethanol for a few minutes (the boiling ethanol dissolves the chlorophyll and turns the leaf white, removing the green color and making the change in color clear to detect).
Spread the leaf out on a white tile after being washed with water to rehydrate and soften it.
use a dropping pipette to add iodine solution.

Hence, iodine test is done to test the presence of starch in a leaf.

Learn more about iodine test:

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Colour changes of a leaf when testing for starch​

Colour changes of a leaf when testing for starch