When leaves are tested for starch with iodine, the portion of leaves that contain starch turns blue-black. The exact changes that take place are not yet fully understood, however it is believed that the iodide ions get stuck in the amylose molecule and that a starch-iodine complex is formed, which gives this blue-black color.

The test for starch is one of the most common experiments in biology. It is used to determine whether or not a plant has been performing photosynthesis and producing starch. The test is simple and can be done with just a few materials. The materials needed are iodine solution and a leaf from a plant.

To perform the test, you need to take a leaf from a plant and place it in boiling water for a few minutes. This will kill the cells in the leaf and stop any chemical reactions from taking place. After boiling, remove the leaf from the water and rinse it with cold water.

Next, place the leaf on a white tile or piece of paper and cover it with iodine solution. Make sure that the entire leaf is covered with iodine solution. After a few minutes, the parts of the leaf that contain starch turn the iodine from brown to blue/black. A blue-black colour with iodine solution indicates that starch is present.

In conclusion, when leaves are tested for starch with iodine, the portion of leaves that contain starch turns blue-black. The test for starch is one of the most common experiments in biology and can be done with just a few materials. The materials needed are iodine solution and a leaf from a plant.

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- https://www.enotes.com/homework-help/iodine-used-test-leaf-starch-what-happens-iodine-588540
- https://www.bbc.co.uk/bitesize/guides/zpcvbk7/revision/3
- https://learning-center.homesciencetools.com/article/test-for-starch-photosynthesis/
- https://practicalbiology.org/standard-techniques/testing-leaves-for-starch-the-technique
- https://chem.libretexts.org/Bookshelves/Biological_Chemistry/Supplemental_Modules_%28Biological_Chemistry%29/Carbohydrates/Case_Studies/Starch_and_Iodine

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