Sahil placed some pieces of chapati in test tube A. Neha placed chewed chapati in test tube B and Santushti took boiled Class 7
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Sahil placed some pieces of chapati in test tube A. Neha placed chewed chapati in test tube B, and Santushti took boiled Class 7
Sahil placed some pieces of chapati in test tube A. Neha placed chewed chapati in test tube B, and Santushti took boiled and mashed potato in test tube C. All of them added a few drops of iodine solution to their test tubes A, B, and C, respectively. What would be their observations? Give reasons. Class 7
Answer:
The observations can be explained by the given table:
| Test Tube | Material | Iodine solution | Observation | |
| A | Sahil - pieces of Chapati | Yes | Blue-black colour | Starch is present and undigested |
| B | Neha - Chewed chapati | Yes | Light blue-black or no colour change | Starch is partially digested into sugars by saliva which contains enzyme |
| C | Santushti - boiled and mashed potato | Yes | Blue-black colour | Potato contains a lot of starch that reacts strongly with iodine |