When iodine comes into contact with starch, it forms a blue-black complex. Therefore, if you were to apply iodine to a cut onion, the starch present in the onion cells would react with the iodine, turning the onion a blue-black color. This color change is a common test for the presence of starch in biological samples.
well it depends what relegion the onion is for example if the onion is christian it is against its beliefs to contain starch if he is budda it is most definitrly the onion will contain starch or hell either have a shag with a sheep :)
there will be change in the color for iodine into blue,black because of the presence of starch in it.
there will be change in the color for iodine into blue,black because of the presence of starch in it.
there will be change in the color for iodine into blue,black because of the presence of starch in it.
there will be change in the color for iodine into blue,black because of the presence of starch in it.
there will be change in the color for iodine into blue,black because of the presence of starch in it.
there will be change in the color for iodine into blue,black because of the presence of starch in it.
The purpose of adding iodine solution to the onion cell is to stain the cell's starch granules. Starch granules will appear blue-black when iodine solution is added, allowing for easy visualization of the presence of starch in the cell.
no it is not
Iodine is used to test for the presence of starch in a substance. Onions contain starch, which reacts with iodine to produce a blue-black color. Rhubarb does not contain a significant amount of starch, so it will not produce the same reaction with iodine.
The iodine test using a starch ewer is mainly used to detect the presence of starch. It specifically tests for the presence of starch molecules by forming a blue-black color in the presence of starch. It does not differentiate between starch and other carbohydrates.