They took four test tubes and label them A, B, C, D. In A they put Potato piece, B- Grind pulse, C- Crushed cashews and in D- water which acts as a control.
They then put some water . After that they put iodine solution and tested for starch . They repeated the steps and then performed biuret test (with copper sulfate solution and sodium hydroxide) .
They observed colour change in different foods. Food containing starch turn blue-black and food containing protein turn violet in colour.
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