Question
Download Solution PDFThe rice water turns blue-black on addition of a few drops of iodine solution. This indicates the presence of:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
Testing starch in food
- We can use an iodine solution to test for the presence of starch. If starch is present as a food item, it turns a blue-black colour when iodine solution is added to it.
At the end of the experiment when the leaf was tested for starch with iodine, the leaf was found to be blue-black in colour.
The rice water turns blue-black on the addition of a few drops of iodine solution. This indicates the presence of starch.
Experiment:
Starch is a powdery white substance consisting of glucose and is used by plants as food.
Presence of starch can be tested by Iodine test
AIM: Test the presence of starch in leaves.
Requirements:
- Glass Jar
- Stove and pan
- Iodine solution
- A leaf
- Alcohol
METHOD/PROCEDURE:
- Step1: First Boil the leaf in a glass jar of alcohol with the help of stove (This action will remove the green pigment chlorophyll).
- Step-2: Insert two drops of iodine solution on a leaf.
- Step-3: Color of the leaf changes to blue colour. (This indicates the presence of starch in leaves.)
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