In the lab, you are given a plant sample and asked to determine the type of plant tissue. After looking in the microscope, you have a hypothesis and to test it you apply iodine to the sample. Areas of the sample turn a very blue-black. Based on this analysis, you determine that:.

the sample contains starch and starch is stored in ground tissue.

Explanation:

It should be understood that Iodine solution is used to test leaves for the presence of starch. This will show a blue-black color, which means the presence of starch.

This process can simply be demonstrated by simply following these steps.

* Take two potted plants of the same kind.

* Keep one in the dark (or in a black box) for 72 hours and the other in the sunlight.

* Take one leaf from each of the plants.

* Put few drops of iodine solution on each of the leaves.

* The leaf kept in the sunlight will turn blue-black due to presence of starch.

* The leaf kept in the dark will not turn blue-black because of absence of starch.

In conclusion, the iodine is used to test for starch.

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