0
Still curious? Ask our experts.
Chat with our AI personalities
Taiga
Rafa
FranBean seeds will give a positive test for starch because they contain amyloplasts that store starch. When a solution of iodine is added to the crushed bean seeds, the iodine will react with the starch present in the amyloplasts, resulting in a blue-black color change, indicating the presence of starch.
Add your answer:
Earn +20 pts
Does ground nut seed give blue black colour with iodine solution?
Yes, groundnut seeds typically give a blue-black color with iodine solution due to the presence of starch in the seeds. When iodine comes in contact with starch, it forms a dark blue to black complex.
Does starch gives positive result for Benedict test?
Yes, starch does not give a positive result for the Benedict test because starch is a complex carbohydrate composed of multiple glucose units linked together in long chains. Benedict's reagent is used to test for the presence of reducing sugars, such as glucose and fructose, which can reduce the copper ions in the reagent, causing a color change. Starch does not have the ability to reduce the copper ions in Benedict's solution.
Why cant you simply add iodine to an untreated leaf to test for starch?
Iodine is not a direct indicator of starch on untreated leaves because there may be other substances present that could give false positive results. Staining with iodine is more effective after boiling the leaf to remove other compounds and facilitate the starch-iodine reaction. This process ensures that the iodine specifically reacts with starch molecules.
What is principle of iodine test?
The principle of the iodine test is based on the ability of iodine to form a starch-iodine complex, which is a blue-black color. This test is commonly used to detect the presence of starch in a sample by observing a color change when iodine is added. If starch is present, the blue-black color will appear, indicating a positive result for the presence of starch.
Why does chips contain starch?
Chips are made from potatoes which naturally contain starch. The starch helps to give the chips their texture and crispiness when they are fried.
